這是我的DBML設計代碼dataclassesdatacontext'不包含帶0參數的構造函數?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Linq;
using System.Data.Linq.Mapping;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
public partial class DataClassesDataContext : System.Data.Linq.DataContext
{
private static System.Data.Linq.Mapping.MappingSource mappingSource = new AttributeMappingSource();
#region Extensibility Method Definitions
partial void OnCreated();
#endregion
public DataClassesDataContext(string connection) :
base(connection, mappingSource)
{
OnCreated();
}
public DataClassesDataContext(System.Data.IDbConnection connection) :
base(connection, mappingSource)
{
OnCreated();
}
public DataClassesDataContext(string connection, System.Data.Linq.Mapping.MappingSource mappingSource) :
base(connection, mappingSource)
{
OnCreated();
}
public DataClassesDataContext(System.Data.IDbConnection connection, System.Data.Linq.Mapping.MappingSource mappingSource) :
base(connection, mappingSource)
{
OnCreated();
}
}
這是我的C#代碼
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Linq;
public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void cmdLogin_Click(object sender, EventArgs e)
{
DataClassesDataContext db = new DataClassesDataContext();
}
}
當我寫的DataClassesDataContex分貝=新DataClassesDataContex();它會顯示DataClassesDataContex不包含一個構造函數,它需要0個參數?
看看DataClassesDataContext - 除非你有另一個帶有附加構造函數的分類的文件,否則我看不到任何無參數的構造函數。 – Tim
那我該怎麼辦? –
Umm ....使用DataClassesDataContext提供的四個構造函數之一? – Tim