DataTable和List互转

Posted 2021-01-01 guzhengtao

/// <summary>
/// list转datatable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <returns></returns>
public DataTable ListToDt<T>(IEnumerable<T> collection)
{
var props = typeof(T).GetProperties();
var dt = new DataTable();
dt.Columns.AddRange(props.Select(p => new DataColumn(p.Name, p.PropertyType)).ToArray());
if (collection.Count() > 0)
{
for (int i = 0; i < collection.Count(); i++)
{
ArrayList tempList = new ArrayList();
foreach (PropertyInfo pi in props)
{
object obj = pi.GetValue(collection.ElementAt(i), null);
tempList.Add(obj);
}
object[] array = tempList.ToArray();
dt.LoadDataRow(array, true);
}
}
return dt;
}

list转datatable

public class DtToList<T> where T : new()
{
/// <summary>
/// datatable转list
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static List<T> ConvertToModel(DataTable dt)
{

List<T> ts = new List<T>();// 定义集合
Type type = typeof(T); // 获得此模型的类型
string tempName = "";
foreach (DataRow dr in dt.Rows)
{
T t = new T();
PropertyInfo[] propertys = t.GetType().GetProperties();// 获得此模型的公共属性
foreach (PropertyInfo pi in propertys)
{
tempName = pi.Name;
if (dt.Columns.Contains(tempName))
{
if (!pi.CanWrite) continue;
object value = dr[tempName];
if (value != DBNull.Value)
pi.SetValue(t, value, null);
}
}
ts.Add(t);
}
return ts;
}
}

datatable转list