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324 lines
12 KiB
324 lines
12 KiB
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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namespace EasyBL
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{
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public static class ComTool
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{
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/// <summary>
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/// Converts DataTable To List
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/// </summary>
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/// <typeparam name="TSource"></typeparam>
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/// <param name="dataTable"></param>
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/// <returns></returns>
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public static List<TSource> ToList_1<TSource>(this DataTable dataTable) where TSource : new()
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{
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var dataList = new List<TSource>();
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const BindingFlags flags = BindingFlags.Public | BindingFlags.Instance | BindingFlags.NonPublic;
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var objFieldNames = (from PropertyInfo aProp in typeof(TSource).GetProperties(flags)
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select new
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{
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aProp.Name,
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Type = Nullable.GetUnderlyingType(aProp.PropertyType) ??
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aProp.PropertyType
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}).ToList();
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var dataTblFieldNames = (from DataColumn aHeader in dataTable.Columns
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select new
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{
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Name = aHeader.ColumnName,
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Type = aHeader.DataType
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}).ToList();
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var commonFields = objFieldNames.Intersect(dataTblFieldNames).ToList();
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foreach (DataRow dataRow in dataTable.AsEnumerable().ToList())
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{
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var aTSource = new TSource();
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foreach (var aField in commonFields)
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{
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var propertyInfos = aTSource.GetType().GetProperty(aField.Name);
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var value = (dataRow[aField.Name] == DBNull.Value) ?
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null : dataRow[aField.Name]; //if database field is nullable
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propertyInfos.SetValue(aTSource, value, null);
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}
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dataList.Add(aTSource);
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}
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return dataList;
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}
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/// <summary>
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/// 將自動轉table。
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/// 通常會搭配
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="data"></param>
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/// <param name="tableName"></param>
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/// <returns></returns>
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public static DataTable ListToDataTable<T>(this IList<T> data, string tableName = "tb")
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{
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var table = new DataTable(tableName);
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//special handling for value types and string
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if (typeof(T).IsValueType || typeof(T).Equals(typeof(string)))
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{
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var dc = new DataColumn("Value");
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table.Columns.Add(dc);
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foreach (T item in data)
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{
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var dr = table.NewRow();
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dr[0] = item;
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table.Rows.Add(dr);
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}
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}
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else
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{
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var properties = TypeDescriptor.GetProperties(typeof(T));
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foreach (PropertyDescriptor prop in properties)
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{
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table.Columns.Add(prop.Name,
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Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType);
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}
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foreach (T item in data)
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{
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var row = table.NewRow();
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foreach (PropertyDescriptor prop in properties)
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{
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try
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{
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row[prop.Name] = prop.GetValue(item) ?? DBNull.Value;
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}
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catch (Exception)
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{
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row[prop.Name] = DBNull.Value;
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}
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}
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table.Rows.Add(row);
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}
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}
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return table;
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}
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/// <summary>
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/// <param name="list">todo: describe list parameter on ToDataTable</param><param
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/// name="list">todo: describe list parameter on ToDataTable</param> 转化一个DataTable
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/// </summary>
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/// <param name="list">todo: describe list parameter on ToDataTable</param>
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/// <typeparam name="T"></typeparam>
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/// <param name="list"></param>
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/// <returns></returns>
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public static DataTable ToDataTable<T>(this IEnumerable<T> list)
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{
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//创建属性的集合
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var pList = new List<PropertyInfo>();
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//获得反射的入口
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var type = typeof(T);
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var dt = new DataTable();
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//把所有的public属性加入到集合 并添加DataTable的列
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Array.ForEach<PropertyInfo>(type.GetProperties(), p => { pList.Add(p); dt.Columns.Add(p.Name, p.PropertyType); });
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foreach (var item in list)
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{
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//创建一个DataRow实例
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var row = dt.NewRow();
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//给row 赋值
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pList.ForEach(p => row[p.Name] = p.GetValue(item, null));
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//加入到DataTable
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dt.Rows.Add(row);
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}
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return dt;
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}
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/// <summary>
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/// DataTable 转换为List 集合
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/// </summary>
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/// <typeparam name="TResult">类型</typeparam>
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/// <param name="dt">DataTable</param>
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/// <returns></returns>
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public static List<T> ToList<T>(this DataTable dt) where T : class, new()
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{
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//创建一个属性的列表
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var prlist = new List<PropertyInfo>();
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//获取TResult的类型实例 反射的入口
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var t = typeof(T);
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//获得TResult 的所有的Public 属性 并找出TResult属性和DataTable的列名称相同的属性(PropertyInfo) 并加入到属性列表
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Array.ForEach<PropertyInfo>(t.GetProperties(), p => { if (dt.Columns.IndexOf(p.Name) != -1) prlist.Add(p); });
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//创建返回的集合
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var oblist = new List<T>();
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foreach (DataRow row in dt.Rows)
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{
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//创建TResult的实例
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var ob = new T();
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//找到对应的数据 并赋值
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prlist.ForEach(p => { if (row[p.Name] != DBNull.Value) p.SetValue(ob, row[p.Name], null); });
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//放入到返回的集合中.
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oblist.Add(ob);
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}
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return oblist;
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}
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/// <summary>
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/// 将集合类转换成DataTable
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/// </summary>
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/// <param name="list">集合</param>
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/// <returns></returns>
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public static DataTable ToDataTableTow(IList list)
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{
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var result = new DataTable();
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if (list.Count > 0)
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{
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var propertys = list[0].GetType().GetProperties();
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foreach (PropertyInfo pi in propertys)
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{
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result.Columns.Add(pi.Name, pi.PropertyType);
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}
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for (int i = 0; i < list.Count; i++)
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{
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var tempList = new ArrayList();
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foreach (PropertyInfo pi in propertys)
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{
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var obj = pi.GetValue(list[i], null);
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tempList.Add(obj);
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}
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var array = tempList.ToArray();
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result.LoadDataRow(array, true);
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}
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}
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return result;
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}
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/// <summary>
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/// 将集合类转换成DataTable
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/// </summary>
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/// <param name="list">集合</param>
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/// <returns></returns>
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public static DataTable DicToDataTable(List<Dictionary<string, object>> list)
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{
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var result = new DataTable("tb");
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if (list.Count > 0)
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{
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var dic = list[0];
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foreach (string key in dic.Keys)
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{
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result.Columns.Add(key);
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}
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foreach (Dictionary<string, object> info in list)
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{
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var tempList = new ArrayList();
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foreach (string key in info.Keys)
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{
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tempList.Add(info[key]);
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}
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var array = tempList.ToArray();
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result.LoadDataRow(array, true);
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}
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}
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return result;
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}
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/// <summary>
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/// 将泛型集合类转换成DataTable <param name="list">todo: describe list parameter on
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/// ToDataTable</param><param name="list">todo: describe list parameter on ToDataTable</param>
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/// </summary>
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/// <typeparam name="T">集合项类型</typeparam>
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/// <param name="list">集合</param>
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/// <returns>数据集(表)</returns>
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public static DataTable ToDataTable<T>(IList<T> list)
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{
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return ToDataTable<T>(list, null);
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}
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/// <summary>
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/// 将泛型集合类转换成DataTable
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/// </summary>
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/// <typeparam name="T">集合项类型</typeparam>
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/// <param name="list">集合</param>
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/// <param name="propertyName">需要返回的列的列名</param>
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/// <returns>数据集(表)</returns>
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public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName)
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{
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var propertyNameList = new List<string>();
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if (propertyName != null)
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propertyNameList.AddRange(propertyName);
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var result = new DataTable();
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if (list.Count > 0)
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{
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var propertys = list[0].GetType().GetProperties();
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foreach (PropertyInfo pi in propertys)
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{
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if (propertyNameList.Count == 0)
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{
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result.Columns.Add(pi.Name, pi.PropertyType);
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}
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else
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{
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if (propertyNameList.Contains(pi.Name))
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result.Columns.Add(pi.Name, pi.PropertyType);
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}
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}
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for (int i = 0; i < list.Count; i++)
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{
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var tempList = new ArrayList();
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foreach (PropertyInfo pi in propertys)
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{
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if (propertyNameList.Count == 0)
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{
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var obj = pi.GetValue(list[i], null);
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tempList.Add(obj);
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}
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else
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{
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if (propertyNameList.Contains(pi.Name))
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{
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var obj = pi.GetValue(list[i], null);
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tempList.Add(obj);
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}
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}
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}
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var array = tempList.ToArray();
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result.LoadDataRow(array, true);
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}
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}
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return result;
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}
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public static string PadLeftEx(string str, int totalByteCount, char c)
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{
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var coding = Encoding.GetEncoding("gb2312");
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var dcount = 0;
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foreach (char ch in str.ToCharArray())
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{
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if (coding.GetByteCount(ch.ToString()) == 2)
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dcount++;
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}
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var w = str.PadRight(totalByteCount - dcount, c);
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return w;
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}
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public static string PadRightEx(string str, int totalByteCount, char c)
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{
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var coding = Encoding.GetEncoding("gb2312");
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var dcount = 0;
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foreach (char ch in str.ToCharArray())
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{
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if (coding.GetByteCount(ch.ToString()) == 2)
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dcount++;
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}
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var w = str.PadRight(totalByteCount - dcount, c);
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return w;
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}
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}
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}
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