将DataTable集合反射获取 List<M>
/// <summary>
/// 根据DataTable集合反射获取 List<M>
/// </summary>
/// <typeparam name="M">泛型实体</typeparam>
/// <param name="dt">DataTable</param>
/// <returns>实体集合</returns>
private static List<M> SetValueRow<M>(DataTable dt) where M : new()
{
List<M> list = new List<M>(); Type type;
PropertyInfo p;
M m; foreach (DataRow row in dt.Rows)
{
m = new M();
type = m.GetType(); foreach (DataColumn col in dt.Columns)
{
//获取一个字段的属性
p = type.GetProperty(col.ColumnName); //实体中无对应属性
if (p == null)
continue; string colDbType = row[col.ColumnName].GetType().FullName; //结果集单元格中的值不为空时才赋值
if (colDbType != "System.DBNull")
{
switch (p.PropertyType.FullName)
{
case "System.Int64"://根据不同数据库数据类型作转换，如oracle的number(2)应转换为Int32，而不是默认的Decemal
p.SetValue(m, Convert.ToInt64(row[col.ColumnName]), null);
break; case "System.Int32":
p.SetValue(m, Convert.ToInt32(row[col.ColumnName]), null);
break; case "System.Int16":
p.SetValue(m, Convert.ToInt16(row[col.ColumnName]), null);
break; case "System.String":
p.SetValue(m, Convert.ToString(row[col.ColumnName]), null);
break; case "System.Decimal":
p.SetValue(m, Convert.ToDecimal(row[col.ColumnName]), null);
break; case "System.DateTime":
p.SetValue(m, row[col.ColumnName], null);
break; case "System.Double":
p.SetValue(m, Convert.ToDouble(row[col.ColumnName]), null);
break; case "System.Boolean":
p.SetValue(m, Convert.ToBoolean(row[col.ColumnName]), null);
break; case "System.Byte":
p.SetValue(m, Convert.ToByte(row[col.ColumnName]), null);
break; default:
p.SetValue(m, row[col.ColumnName], null);
break;
}
}
} list.Add(m);
} return list;
}
将IList集合类转换成DataTable
/// <summary>
/// 将IList集合类转换成DataTable
/// </summary>
/// <param name="list">集合</param>
/// <returns></returns>
public static DataTable IListToDataTable(IList list)
{
DataTable result = new DataTable();
if (list.Count > )
{
PropertyInfo[] propertys = list[].GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
result.Columns.Add(pi.Name, pi.PropertyType);
} for (int i = ; 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;
}
将List<M>集合类转换成DataTable
/// <summary>
/// 将List<M>集合类转换成DataTable
/// </summary>
/// <param name="list">集合</param>
/// <returns></returns>
public static DataTable IListToDataTable<M>(List<M> list)
{
DataTable result = new DataTable();
if (list.Count > )
{
PropertyInfo[] propertys = list[].GetType().GetProperties();
foreach (PropertyInfo pi in propertys)
{
result.Columns.Add(pi.Name, pi.PropertyType);
} for (int i = ; 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;
}
全局静态类 泛型方法
/// <summary>
/// 全局静态类
/// </summary>
public static class GlobalStaticClass : Object
{ public static List<M> ToModelList<M>(this object obj) where M : new()
{
List<M> list = new List<M>(); Type type;
PropertyInfo p;
M m;
DataTable dt = (DataTable)obj; foreach (DataRow row in dt.Rows)
{
m = new M();
type = m.GetType(); foreach (DataColumn col in dt.Columns)
{
//获取一个字段的属性
p = type.GetProperty(col.ColumnName); //实体中无对应属性
if (p == null)
continue; string colDbType = row[col.ColumnName].GetType().FullName; //结果集单元格中的值不为空时才赋值
if (colDbType != "System.DBNull")
{
switch (p.PropertyType.FullName)
{
case "System.Int64"://根据不同数据库数据类型作转换，如oracle的number(2)应转换为Int32，而不是默认的Decemal
p.SetValue(m, Convert.ToInt64(row[col.ColumnName]), null);
break; case "System.Int32":
p.SetValue(m, Convert.ToInt32(row[col.ColumnName]), null);
break; case "System.Int16":
p.SetValue(m, Convert.ToInt16(row[col.ColumnName]), null);
break; case "System.String":
p.SetValue(m, Convert.ToString(row[col.ColumnName]), null);
break; case "System.Decimal":
p.SetValue(m, Convert.ToDecimal(row[col.ColumnName]), null);
break; case "System.DateTime":
p.SetValue(m, row[col.ColumnName], null);
break; case "System.Double":
p.SetValue(m, Convert.ToDouble(row[col.ColumnName]), null);
break; case "System.Boolean":
p.SetValue(m, Convert.ToBoolean(row[col.ColumnName]), null);
break; case "System.Byte":
p.SetValue(m, Convert.ToByte(row[col.ColumnName]), null);
break; default:
p.SetValue(m, row[col.ColumnName], null);
break;
}
}
} list.Add(m);
} return list;
} }
实体父类，实体继承此类后，实体对象可调用this.SetValue(object) 方法通过反射给自身对象赋值
public class ModelBase
{
protected bool isNull = true;
public bool IsNull
{
get { return isNull; }
set { isNull = value; }
}
protected void SetValue(object info)
{
foreach (FieldInfo fi in info.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Instance))
{
this.GetType().GetField(fi.Name, BindingFlags.NonPublic | BindingFlags.Instance).SetValue(this, fi.GetValue(info));
}
}
public void SetValue(SqlDataReader dr)
{
if (dr.Read())
{
foreach (FieldInfo fi in this.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Instance))
{
if (fi.Name != "isNull")
{
object rel = dr[fi.Name];
if (dr[fi.Name] != Convert.DBNull)
{
fi.SetValue(this, dr[fi.Name]);
} }
}
this.isNull = false;
}
dr.Close();
}
public void SetValue(DataRow dr)
{
foreach (FieldInfo fi in this.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Instance))
{
if (fi.Name != "isNull")
{
if (dr.Table.Columns.Contains(fi.Name))
{
object rel = dr[fi.Name];
if (dr[fi.Name] != Convert.DBNull)
{
fi.SetValue(this, dr[fi.Name]);
}
}
}
}
this.isNull = false; } }