三层架构中，如何返回存储过程的输出参数，我已经设置了方向，还是不行。。还要注意什么呢？？
param.Direction = ParameterDirection.Output;
------解决方案--------------------
参考偶地:
--简单存储过程如下:
----------------------------------------------------
CREATE PROC P_TEST
@Name VARCHAR(20),
@Rowcount INT OUTPUT
AS
BEGIN
SELECT * FROM T_Customer WHERE [email protected]
SET @Rowcount=@@ROWCOUNT
END
GO
----------------------------------------------------
--存储过程调用如下:
----------------------------------------------------
DECLARE @i INT
EXEC P_TEST 'A ',@i OUTPUT
SELECT @i
--结果
/*
Name Address Tel
---------- ---------- --------------------
A Address Telphone
（所影响的行数为 1 行）
-----------
1
（所影响的行数为 1 行）
*/
----------------------------------------------------
--DotNet 部分(C#)
--WebConfig 文件:
----------------------------------------------------
......
</system.web>
<!-- 数据库连接字符串
-->
<appSettings>
<add key= "ConnectString " value= "server=(local);User ID=sa;Password=;database=Test " />
</appSettings>
</configuration>
----------------------------------------------------
--C#代码:(用到两个测试控件,DataGrid1(用于显示绑定结果集合),Lable(用于显示存储过程返回单值)
----------------------------------------------------
//添加数据库引用
using System.Data.SqlClient;
......
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
String DBConnStr;
DataSet MyDataSet=new DataSet();
System.Data.SqlClient.SqlDataAdapter DataAdapter=new System.Data.SqlClient.SqlDataAdapter();
DBConnStr=System.Configuration.ConfigurationSettings.AppSettings[ "ConnectString "];
System.Data.SqlClient.SqlConnection myConnection = new System.Data.SqlClient.SqlConnection(DBConnStr);
if (myConnection.State!=ConnectionState.Open)
{
myConnection.Open();
}
System.Data.SqlClient.SqlCommand myCommand = new System.Data.SqlClient.SqlCommand( "P_Test ",myConnection);
myCommand.CommandType=CommandType.StoredProcedure;
//添加输入查询参数、赋予值
myCommand.Parameters.Add( "@Name ",SqlDbType.VarChar);
myCommand.Parameters[ "@Name "].Value = "A ";
//添加输出参数
myCommand.Parameters.Add( "@Rowcount ",SqlDbType.Int);
myCommand.Parameters[ "@Rowcount "].Direction=ParameterDirection.Output;
myCommand.ExecuteNonQuery();
DataAdapter.SelectCommand = myCommand;
if (MyDataSet!=null)
{
DataAdapter.Fill(MyDataSet, "table ");
}
DataGrid1.DataSource=MyDataSet;
DataGrid1.DataBind();
//得到存储过程输出参数
Label1.Text=myCommand.Parameters[ "@Rowcount "].Value.ToString();
if (myConnection.State == ConnectionState.Open)
{
myConnection.Close();
}
}
----------------------------------------------------
运行以上代码即可(返回记录集合和存储过程返回值)