C# List与DataTable的相互转化

List与Data的转化比较简单，网上也很多。但是大多都有一个Bug：当实体类有可空类型的属性时，转化会出异常（DATASET不支持System.Nullable异常）

下面的方法可以避免出现这个问题。

①List转DataTable

#region  反射List To DataTable
/// <summary>
/// 将集合类转换成DataTable
/// </summary>
/// <param name="list">集合</param>
/// <returns></returns>
public static DataTable ListToDataTable(IList list)
{
DataTable result = new DataTable();
if (list.Count > 0)
{
PropertyInfo[] propertys = list[0].GetType().GetProperties();

foreach (PropertyInfo pi in propertys)
{
Type colType = pi.PropertyType;
if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition() == typeof(Nullable<>)))
{
colType = colType.GetGenericArguments()[0];
}
result.Columns.Add(new DataColumn(pi.Name, colType));
}

for (int i = 0; i < list.Count; i++)
{
ArrayList tempList = new ArrayList();
foreach (PropertyInfo pi in propertys)
{
object obj = pi.GetValue(list[i], null);
tempList.Add(obj);
}
object[] array = tempList.ToArray();
result.LoadDataRow(array, true);
}
}
return result;
}