[英]Query Won't Work in ASP.net
如果查詢結果為btn1.CommandArgument =,我試圖隱藏此按鈕。
該查詢有效,因為我已經對其進行了測試,但是整個解決方案均無效。
如果我更換
myCommand.ExecuteScalar().ToString()
在查詢結果的if
語句中,按鈕是隱藏的。
我看了好幾次,但是找不到任何問題。 謝謝。
protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
Button btn1 = (Button)e.Item.FindControl("addFollowerButton");
// request Query string
var querystring = Request.QueryString["ProjectId"];
string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
string select = "Select ProfileId from Project_Follower Where ProjectId = @ProjectId";
using (SqlConnection myConnection = new SqlConnection(connectionString))
{
myConnection.Open();
SqlCommand myCommand = new SqlCommand(select, myConnection);
myCommand.Parameters.AddWithValue("@ProjectId", querystring);
myCommand.ExecuteScalar();
if (myCommand.ExecuteScalar().ToString() == btn1.CommandArgument.ToString())
{
Button hdn = (Button)e.Item.FindControl("addFollowerButton");
btn1.Visible = false;
}
}
}
您只需執行一次 .ExecuteScalar()
調用! 抓取結果(類型為object
),然后檢查以確保其不為null
,如果是,則對它調用.ToString()
並與要檢查的另一個字符串進行比較:
using (SqlConnection myConnection = new SqlConnection(connectionString))
{
myConnection.Open();
SqlCommand myCommand = new SqlCommand(select, myConnection);
myCommand.Parameters.AddWithValue("@ProjectId", querystring);
object result = myCommand.ExecuteScalar();
if (result != null && result.ToString().Equals(btn1.CommandArgument.ToString()))
{
Button hdn = (Button)e.Item.FindControl("addFollowerButton");
btn1.Visible = false;
}
}
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