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using System;
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using System.Collections.Generic;
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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.Web;
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/// <summary>
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/// DataTableEx 的摘要说明
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/// </summary>
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public static class DataTableEx
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{
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public static List<T> ToList<T>(this DataTable dt) where T : new()
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{
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List<T> ts = new List<T>();
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foreach (DataRow dr in dt.Rows)
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{
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T t = new T();
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foreach (var c in dt.Columns)
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{
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object value = dr[c.ToString()];
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if (value != DBNull.Value)
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{
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var p = t.GetType().GetProperty(c.ToString());
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if (p != null)
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{
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p.SetValue(t, ConvertHelper.ChangeType(value, p.PropertyType), null);
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}
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}
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}
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ts.Add(t);
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}
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return ts;
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}
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public static List<T> ConvertTo<T>(DataTable datatable) where T : new()
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{
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var temp = new List<T>();
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try
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{
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var columnsNames = (from DataColumn dataColumn in datatable.Columns select dataColumn.ColumnName).ToList();
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temp = datatable.AsEnumerable().ToList().ConvertAll<T>(row => GetObject<T>(row, columnsNames));
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return temp;
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}
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catch
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{
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return temp;
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}
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}
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private static T GetObject<T>(DataRow row, List<string> columnsName) where T : new()
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{
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T obj = new T();
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try
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{
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string columnname = "";
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PropertyInfo[] Properties = typeof(T).GetProperties();
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foreach (PropertyInfo objProperty in Properties)
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{
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columnname = columnsName.Find(name => name.ToLower() == objProperty.Name.ToLower());
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if (!string.IsNullOrEmpty(columnname))
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{
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var value = row[columnname];
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if (!string.IsNullOrEmpty(value.ToString()))
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{
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Type type;
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type = Nullable.GetUnderlyingType(objProperty.PropertyType) ?? objProperty.PropertyType;
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objProperty.SetValue(obj,
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type == value.GetType()
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? Convert.ChangeType(value, type)
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: System.Enum.ToObject(type, value), null);
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}
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}
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}
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return obj;
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}
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catch (Exception exception)
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{
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return obj;
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}
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}
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/// <summary>
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/// 单字段值
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/// </summary>
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/// <returns></returns>
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public static List<string> ToList(this DataTable dt)
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{
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List<string> ts = new List<string>();
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foreach (DataRow dr in dt.Rows)
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{
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foreach (var c in dt.Columns)
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{
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object value = dr[c.ToString()];
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if (value != DBNull.Value)
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{
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ts.Add(value.ToString());
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}
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}
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}
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return ts;
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}
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public static T ToData<T>(this DataTable dt) where T : new()
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{
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if (dt.Rows.Count > 1)
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{
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throw new Exception("");
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}
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List<T> ts = new List<T>();
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foreach (DataRow dr in dt.Rows)
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{
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T t = new T();
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foreach (var c in dt.Columns)
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{
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object value = dr[c.ToString()];
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if (value != DBNull.Value)
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{
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var p = t.GetType().GetProperty(c.ToString());
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if (p != null)
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{
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p.SetValue(t, ConvertHelper.ChangeType(value, p.PropertyType), null);
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}
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}
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}
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return t;
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}
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return default(T);
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}
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public static void FillData<T>(this DataTable dt, ref T t) where T : new()
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{
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if (dt.Rows.Count > 1)
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{
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throw new Exception("");
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}
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foreach (DataRow dr in dt.Rows)
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{
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foreach (var c in dt.Columns)
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{
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object value = dr[c.ToString()];
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if (value != DBNull.Value)
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{
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var p = t.GetType().GetProperty(c.ToString());
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if (p != null)
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{
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p.SetValue(t, ConvertHelper.ChangeType(value, p.PropertyType), null);
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}
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}
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}
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}
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}
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/// <summary>
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/// list转化为table
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="entitys"></param>
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/// <returns></returns>
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public static DataTable ListToDataTable<T>(List<T> entitys)
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{
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//检查实体集合不能为空
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if (entitys == null || entitys.Count < 1)
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{
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return new DataTable();
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}
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//取出第一个实体的所有Propertie
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Type entityType = entitys[0].GetType();
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PropertyInfo[] entityProperties = entityType.GetProperties();
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//生成DataTable的structure
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//生产代码中，应将生成的DataTable结构Cache起来，此处略
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DataTable dt = new DataTable("dt");
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for (int i = 0; i < entityProperties.Length; i++)
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{
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//dt.Columns.Add(entityProperties[i].Name, entityProperties[i].PropertyType);
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dt.Columns.Add(entityProperties[i].Name);
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}
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//将所有entity添加到DataTable中
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foreach (object entity in entitys)
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{
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//检查所有的的实体都为同一类型
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if (entity.GetType() != entityType)
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{
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throw new Exception("要转换的集合元素类型不一致");
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}
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object[] entityValues = new object[entityProperties.Length];
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for (int i = 0; i < entityProperties.Length; i++)
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{
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entityValues[i] = entityProperties[i].GetValue(entity, null);
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}
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dt.Rows.Add(entityValues);
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}
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return dt;
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}
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/// <summary>
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/// 查询指定条数分页
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/// </summary>
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/// <returns></returns>
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public static DataTable GetPageToTable(DataTable dt, int StartNum, int EndNum)
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{
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//0页代表每页数据，直接返回
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if (EndNum == 0) return dt;
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//数据源为空返回空DataTable
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if (dt == null) return new DataTable();
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DataTable newdt = dt.Copy();
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newdt.Clear();//copy dt的框架
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if (StartNum >= dt.Rows.Count)
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return newdt;//源数据记录数小于等于要显示的记录，直接返回dt
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if (EndNum > dt.Rows.Count)
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EndNum = dt.Rows.Count;
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for (int i = StartNum; i <= EndNum - 1; i++)
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{
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DataRow newdr = newdt.NewRow();
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DataRow dr = dt.Rows[i];
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foreach (DataColumn column in dt.Columns)
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{
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newdr[column.ColumnName] = dr[column.ColumnName];
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}
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newdt.Rows.Add(newdr);
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}
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return newdt;
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}
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}
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public static class ConvertHelper
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{
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public static object ChangeType(object obj, Type conversionType)
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{
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return ChangeType(obj, conversionType, System.Threading.Thread.CurrentThread.CurrentCulture);
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}
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public static object ChangeType(object obj, Type conversionType, IFormatProvider provider)
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{
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#region Nullable
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Type nullableType = Nullable.GetUnderlyingType(conversionType);
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if (nullableType != null)
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{
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if (obj == null)
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{
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return null;
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}
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return Convert.ChangeType(obj, nullableType, provider);
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}
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#endregion
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if (typeof(System.Enum).IsAssignableFrom(conversionType))
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{
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return Enum.Parse(conversionType, obj.ToString());
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}
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return Convert.ChangeType(obj, conversionType, provider);
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}
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/// <summary>
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/// 分页
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/// </summary>
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/// <returns></returns>
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public static List<T> PageList<T>(List<T> list, out int total, int pageIndex = 1, int pageSize = 10)
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{
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pageIndex = pageIndex - 1;
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total = 0;
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if (list == null || list.Count == 0)
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return list;
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total = list.Count;
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int startIndex = pageIndex * pageSize;
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if (startIndex + pageSize > list.Count)
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{
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pageSize = list.Count - startIndex;
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}
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if (pageSize <= 0) return new List<T>();
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return list.GetRange(startIndex, pageSize);
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}
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}
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