/// <summary>
/// 下面通过一个方法来实现返回DataTable类型
/// LINQ返回DataTable类型
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="varlist"></param>
/// <returns></returns>
public static DataTable ToDataTable<T>(IEnumerable<T> varlist)
{
DataTable dtReturn = new DataTable();
// column names
PropertyInfo[] oProps = null;
if (varlist == null)
return dtReturn;
foreach (T rec in varlist)
{
if (oProps == null)
{
oProps = ((Type)rec.GetType()).GetProperties();
foreach (PropertyInfo pi in oProps)
{
Type colType = pi.PropertyType;
if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition()
== typeof(Nullable<>)))
{
colType = colType.GetGenericArguments()[0];
}
dtReturn.Columns.Add(new DataColumn(pi.Name, colType));
}
}
DataRow dr = dtReturn.NewRow();
foreach (PropertyInfo pi in oProps)
{
dr[pi.Name] = pi.GetValue(rec, null) == null ? DBNull.Value : pi.GetValue
(rec, null);
}
dtReturn.Rows.Add(dr);
}
return dtReturn;
}
public static System.Data.DataTable LinqToDataTable<T>(IEnumerable<T> data)
{
var dt = new System.Data.DataTable();
var ps = typeof(T).GetProperties().ToList();
ps.ForEach(p => dt.Columns.Add(p.Name, p.PropertyType));
foreach (T t in data)
{
var dr = dt.NewRow();
var vs = from p in ps select p.GetValue(t, null);
var ls = vs.ToList();
int i = 0;
ls.ForEach(c => dr[i++] = c);
dt.Rows.Add(dr);
}
return dt;
}
public static System.Data.DataTable ToDataTable<T>(IEnumerable<T> data)
{
var dt = new System.Data.DataTable();
var ps = System.ComponentModel.TypeDescriptor.GetProperties(typeof(T));
foreach (System.ComponentModel.PropertyDescriptor dp in ps)
dt.Columns.Add(dp.Name, dp.PropertyType);
foreach (T t in data)
{
var dr = dt.NewRow();
foreach (System.ComponentModel.PropertyDescriptor dp in ps)
dr[dp.Name] = dp.GetValue(t);
dt.Rows.Add(dr);
}
return dt;
}
原文：http://www.cnblogs.com/volts0302/p/5235843.html