輸出參數到標籤

Question

，而不是將我的存儲過程中的輸出參數值返回到我的標籤，它返回默認值，我將輸出參數設置爲。

爲什麼不能我把我的輸出參數爲我的文字標籤

Dim reader As SqlDataReader 
cmd.Parameters.AddWithValue("@tour", "2365") 

cmd.Parameters.Add("@tourname", SqlDbType.VarChar) 
cmd.Parameters("@tourname").Direction = ParameterDirection.Output 


cmd.CommandText = "test" 
cmd.CommandType = CommandType.StoredProcedure 
cmd.Connection = conn 
conn.Open() 
reader = cmd.ExecuteReader() 

Dim myTable As DataTable = New DataTable() 

myTable.Load(reader) 


DropDownList1.DataSource = myTable 
DropDownList1.DataTextField = "ddate7" 
DropDownList1.DataBind() 



Label1.Text = cmd.Parameters("@tourname").ToString 

conn.Close() 

Answer 1

您還沒有定義@tourname參數作爲輸出參數。

 

Dim param as New SqlParameter("tourname", 2356) 
param.Direction = ParameterDirection.Output 
cmd.Parameters.Add(param)