How to get SQL String Result from Stored Procedure and save it in C# Windows Application string variable

Question

I have the following Stored Procedure :

ALTER PROCEDURE [dbo].[ProcedureName] 

    @date NVARCHAR(50)

AS

BEGIN

    SET NOCOUNT ON;

    DECLARE @result nvarchar(500) -- this one should return string.

    DECLARE @variable1 NVARCHAR(50)
    set @variable1 = (SELECT COUNT(*) FROM dbo.Table1 WHERE column1 not in (select column1 from dbo.Table2))

    DECLARE @variable2 NVARCHAR(50)
    update dbo.Table1 set columnX = 1 where column1 not in (select column1 from  dbo.Table2)

    set @variable2 = @@ROWCOUNT

and so on... it continues like 200 rows of script with at least 10-12 variables

after that I want to get result like this

'Hello,' + 

'Some Text here' + 

@date +': ' + 

'Explaining text for variable1- ' + @variable1 + 

'Updated rows from variable2 - ' + @variable2 + 

'some other select count - ' + @variable3 +

'some other update rowcount - '+ @variable4

......

till now i was able to get this with PRINT Statement, but can't take it to variable in my C# code which goes like this:

public void Execute_Click(object sender, EventArgs e)
{
    if (MessageBox.Show("Are you sure you want to execute the program?", "Confirm Start", MessageBoxButtons.YesNo, MessageBoxIcon.Question) != DialogResult.No)
    {
        string connectionString = GetConnectionString(usernamePicker.Text, passwordPicker.Text);
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            using (SqlCommand cmd = new SqlCommand("dbo.ProcedureName", connection))
            {
                connection.Open();
                cmd.CommandText = "dbo.ProcedureName";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add("@date", SqlDbType.VarChar).Value = dateTimePicker1.Text;

                SqlParameter result = cmd.Parameters.Add("@result", SqlDbType.VarChar);
                result.Direction = ParameterDirection.ReturnValue;

                cmd.ExecuteScalar();
                var resultout = (string)cmd.Parameters["@result"].Value;
                connection.Close();
                TextMessage.Text = dateTimePicker1.Text;
            }
        }
    }
}

all i get for result is 0 or NULL or etc. i tried to return value from SQL with PRINT, RETURN, SET, OUTPUT ....... but nothing seems to work. However fetching variable from C# to SQL seems like child-work. Any ideas?

Answer 1

如果您想将连接字符串作为输出返回，那么在程序结束时只需写select @result. 确保在此语句之前将它连接起来。

这将返回您可以在 c# 代码中用作字符串的字符串。