MSSQL - 存储过程Return返回值

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		HF_Ultrastrong
-- Create date: 2015年7月19日22:09:24
-- Description:	判断是否有数据,并使用Return返回值
-- =============================================
CREATE PROCEDURE ReturnValue
AS
BEGIN
if exists(select * from Tb_Category)
return 100
else
return -100
END

/// <summary>
/// 点击显示参数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"].ToString());
SqlCommand cmd = new SqlCommand("ReturnValue", con);
cmd.CommandType = CommandType.StoredProcedure;

//声明参数接收存储过程返回值
SqlParameter returnValue = cmd.Parameters.Add("returnValue", SqlDbType.Int, 4);
returnValue.Direction = ParameterDirection.ReturnValue;

con.Open();
cmd.ExecuteNonQuery();
con.Close();

this.Label1.Text = Convert.ToString(returnValue.Value);
}

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		HF_Ultrastrong
-- Create date: 2015年7月19日22:09:24
-- Description:	判断是否有数据,并使用Return返回值
-- =============================================
CREATE PROCEDURE ReturnValue
@10 int,
@20 int,
@30 int
AS
BEGIN
if exists(select * from Tb_Category)
return 100
else
return -100
END

/// <summary>
/// 点击显示参数
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"].ToString());
SqlCommand cmd = new SqlCommand("ReturnValue", con);
cmd.CommandType = CommandType.StoredProcedure;

//参数数组
SqlParameter[] para = new SqlParameter[]
{
new SqlParameter("@10", 10),
new SqlParameter("@20", 20),
new SqlParameter("@30", 30),
new SqlParameter("@Return", SqlDbType.Int)
};
cmd.Parameters.AddRange(para);
para[para.Length - 1].Direction = ParameterDirection.ReturnValue;

con.Open();
cmd.ExecuteNonQuery();
con.Close();

object obj = para[para.Length - 1].Value;
this.Label1.Text = Convert.ToString(obj);
}