对象充当List成员时：
/// <summary>
/// 将泛类型集合List类转换成DataTable
/// </summary>
/// <param name=”list”>泛类型集合</param>
/// <returns></returns>
public static DataTable ListToDataTable<T>(List<T> entitys)
{
//检查实体集合不能为空
if (entitys == null || entitys.Count < 1)
{
throw new Exception(“需转换的集合为空”);
}
//取出第一个实体的所有Propertie
Type entityType = entitys[0].GetType();
PropertyInfo[] entityProperties = entityType.GetProperties();
//生成DataTable的structure
//生产代码中，应将生成的DataTable结构Cache起来，此处略
DataTable dt = new DataTable();
for (int i = 0; i < entityProperties.Length; i++)
{
//dt.Columns.Add(entityProperties[i].Name, entityProperties[i].PropertyType);
dt.Columns.Add(entityProperties[i].Name);
}
//将所有entity添加到DataTable中
foreach (object entity in entitys)
{
//检查所有的的实体都为同一类型
if (entity.GetType() != entityType)
{
throw new Exception(“要转换的集合元素类型不一致”);
}
object[] entityValues = new object[entityProperties.Length];
for (int i = 0; i < entityProperties.Length; i++)
{
entityValues[i] = entityProperties[i].GetValue(entity, null);
}
dt.Rows.Add(entityValues);
}
return dt;
}
数组充当List成员时：
public static DataTable ListArrayToDataTable(List<string[]> entitys, string[] colname = null)
{
//检查实体集合不能为空
if (entitys == null || entitys.Count < 1)
{
throw new Exception(“需转换的集合为空”);
}
DataTable dt = new DataTable();
if (colname != null)
{
if (colname.Length != entitys[0].Length)
throw new Exception(“名称数组与成员数组维度不一致”);
foreach (string nm in colname)
dt.Columns.Add(nm, typeof(string));
}
else
{
foreach (string nm in entitys[0])
dt.Columns.Add(“”, typeof(string));
}
//将所有entity添加到DataTable中
foreach (string[] entity in entitys)
{
if (entity.Length != entitys[0].Length)
{
throw new Exception(“数组维度不一致”);
}
dt.Rows.Add(entity);
}
return dt;
}
