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我是網絡開發新手，現在我正在網站上工作。 ASP.Net（前端）Web表單上的Save按鈕有問題（後端在C＃中）。該按鈕應該將輸入到文本框中的數據保存到數據庫中。OnClick按鈕只能在第二次使用Asp.NET c＃
當第一次單擊保存按鈕時，頁面只是'重新加載'並清除文本框，並且沒有任何內容保存在SQL Server數據庫（dbo連接）中。然後，當我在文本框中重新輸入信息後再次單擊相同的「保存」按鈕時，它實際上會保存到數據庫並返回到主菜單頁面（如預期的那樣）。如果我嘗試重新輸入不同的信息，保存按鈕將工作得很好。
當用戶登錄並導航到他輸入數據並保存該數據的頁面時，會發生此問題。它永遠不會第一次工作。
不幸的是，由於保密的目的，我必須省略和重命名某些文件路徑/目錄和表名！
這裏是我的Asp.NET代碼：
<%@ Page Language="C#" debug="True" Inherits="Default" src="Default.cs" AutoEventWireup ="true"%>
<%@ Register TagPrefix="ob" TagName="ComboTree" Src="/obout/Combotree/ComboTree.ascx" %>
<%@ Reference Control="/obout/Combotree/ComboTree.ascx" %>
<HTML>
<HEAD>
<!-- #INCLUDE VIRTUAL="/.../" -->
</HEAD>
<BODY >
<FORM runat="server">
<BASEFONT face="Arial, Helvetica, Sans Serif" color=black size=2>
<TABLE height="100%" cellSpacing=0 cellPadding=0 width="780" align=Center border=0>
<!-- #INCLUDE VIRTUAL="/.../" -->
<TR VALIGN="top">
<!-- #INCLUDE VIRTUAL="/.../" -->
`enter code here`<TD vAlign=top width="100%" HEIGHT="100%">
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0 HEIGHT="100%">
<!-- #INCLUDE VIRTUAL="/.../" -->
<TR>
<!-- #INCLUDE VIRTUAL="/.../" -->
<TD vAlign=top align=left >
<!--- START YOUR CODE HERE!!!!! --->
<script>
function disableListItems(checkBoxListId, disable)
{
// Get the checkboxlist object.
ctr = 0;
while(1 == 1)
{
checkbox = document.getElementById(checkBoxListId + "_" + ctr);
if(checkbox == null)
{
return;
}
checkbox.checked = true;
checkbox.disabled = disable;
ctr++;
}
}
function checkForm()
{
var errMsg = "";
if(isBlank(document.getElementById("tbName").value))
{
errMsg += "\n-Folder Name";
}
if(errMsg!="")
{
alert("The following fields cannot be left blank." + errMsg);
return false;
}
return true;
}
</script>
<font Class="heading">File Library - <ASP:Label ID="lbTitle" RunAt="Server"/> Folder</font>
<INPUT Type="Hidden" ID="hdFolderID" RunAt="Server"/>
<INPUT Type="Hidden" ID="hdParentFolderID" RunAt="Server"/>
<TABLE CellPadding="4" CellSpacing="0" Width="100%" >
<TR>
<TD ColSpan="2" Class="spreadsheet_line"> </TD>
</TR>
<TR>
<TD Class="Spreadsheet"><B>Name</B></TD>
<TD Class="Spreadsheet" Width="100%"><ASP:TextBox ID="tbName" Columns="34" RunAt="Server"/></TD>
</TR>
<TR VAlign="Top" Visible="False" RunAt="Server">
<TD Class="Spreadsheet" NOWRAP><B>Description</B></TD>
<TD Class="Spreadsheet"><ASP:TextBox ID="tbDescription" TextMode="Multiline" Cols="25" Rows="5" RunAt="Server"/></TD>
</TR>
<TR>
<TD Class="Spreadsheet"><B>Active?</B></TD>
<TD Class="Spreadsheet"><ASP:CheckBox ID="cbActive" RunAt="Server"/></TD>
</TR>
<TR Visible="False" RunAt="Server">
<TD Class="Spreadsheet"><B>Folder</B></TD>
<TD Class="Spreadsheet"><ob:ComboTree id="ctFolders" runat="server"/></TD>
</TR>
<TR VAlign="Top" ID="trLicensees" RunAt="Server">
<TD Class="Spreadsheet"><B>Departments</B></TD>
<TD Class="Spreadsheet">
<ASP:DropDownList ID="ddLicensee" DataTextField="Name" DataValueField="DepartmentId" RunAt="Server"/>
<ASP:CheckBox ID="cbAll" Text="All" RunAt="Server"/>
<div style="text-align: left; width: 30%; margin-left:-3px">
<ASP:CheckBoxList ID="cblLicensees" DataTextField="Name" DataValueField="DepartmentId" style="background-color:F3F3F3" RunAt="Server"/> <!--**-->
</div>
</TD>
</TR>
<TR>
<TD Class="Spreadsheet" Align="Right" ColSpan="2">
<ASP:ImageButton ID="btnSave" OnClick="btnSave_OnClick" ImageUrl="/images/buttons/btnSave.gif" RunAt="Server"/>
</TD>
</TR>
</TABLE>
<!--- END YOUR CODE HERE!!!!! --->
</TD>
<!-- #INCLUDE VIRTUAL="/.../" -->
</TR>
<!-- #INCLUDE VIRTUAL="/.../" -->
</TABLE>
</TD>
<!-- #INCLUDE VIRTUAL="/.../" -->
</TR>
<!-- #INCLUDE VIRTUAL="/.../" -->
</TABLE>
</BASEFONT>
</FORM>
</BODY>
</HTML>
這裏是爲C＃編寫的保存按鈕（後端）代碼：
public void btnSave_OnClick(object sender, System.Web.UI.ImageClickEventArgs E){
int counter = int.Parse(Request.Cookies["counter"].Value);
counter++;
Response.Cookies["counter"].Value = counter.ToString();
try{
SqlConnection Conn = GetConnection();
string SQL;
SqlCommand Cmd;
SqlDataReader Dtr;
if(hdFileID.Value=="")
{
Response.Write("Executing Save (adding new folder to DB");
SQL = "EXEC sp_File_Add @Name,@Description,@UserID";
Response.Write("Save successfully executed. Added to DB");
}
else
{
Response.Write("Executing Save (saving info of folder to DB");
SQL = "EXEC sp_File_Update @Name,@Description,@UserID,@FileID";
Response.Write("Save successfully executed. Saved to DB");
}
Cmd = new SqlCommand(SQL,Conn);
Cmd.Parameters.Add(new SqlParameter("@Name", SqlDbType.VarChar));
Cmd.Parameters["@Name"].Value = tbName.Text;
Cmd.Parameters.Add(new SqlParameter("@Description", SqlDbType.Text));
Cmd.Parameters["@Description"].Value = tbDescription.Text;
Cmd.Parameters.Add(new SqlParameter("@UserID", SqlDbType.Int));
Cmd.Parameters["@UserID"].Value = Convert.ToInt32(hdUserID_Global.Value);
if(hdFileID.Value!="")
{
Cmd.Parameters.Add(new SqlParameter("@FileID", SqlDbType.Int));
Cmd.Parameters["@FileID"].Value = Convert.ToInt32(hdFolderID.Value);
}
Cmd.ExecuteNonQuery();
if(hdFileID.Value=="")
{
SQL = "SELECT MAX(FileID) AS FileID FROM tbl_File WHERE [email protected]";
Cmd = new SqlCommand(SQL,Conn);
Cmd.Parameters.Add(new SqlParameter("@UserID", SqlDbType.Int));
Cmd.Parameters["@UserID"].Value = Convert.ToInt32(hdUserID_Global.Value);
Dtr = Cmd.ExecuteReader();
if(Dtr.Read())
{
hdFileID.Value = Dtr["FileID"].ToString();
}
Dtr.Close();
}
SQL = "DELETE FROM tbl_FileLicense ";
SQL += " WHERE [email protected] ";
Cmd = new SqlCommand(SQL,Conn);
Cmd.Parameters.Add(new SqlParameter("@FileID", SqlDbType.Int));
Cmd.Parameters["@FileID"].Value = Convert.ToInt32(hdFileID.Value.ToString());
Cmd.ExecuteNonQuery();
if(ddLicense.Visible)
{
SQL = "EXEC sp_doc_Folder_Add @FileID,@LicenseID,@UserID";
Response.Write("Save successfully executed. Added to DB");
Cmd = new SqlCommand(SQL,Conn);
Cmd.Parameters.Add(new SqlParameter("@FolderID", SqlDbType.Int));
Cmd.Parameters["@FileID"].Value = Convert.ToInt32(hdFileID.Value.ToString());
Cmd.Parameters.Add(new SqlParameter("@LicenseID", SqlDbType.Int));
Cmd.Parameters["@LicenseID"].Value = Convert.ToInt32(ddLicense.SelectedItem.Value.ToString());
Cmd.Parameters.Add(new SqlParameter("@UserID", SqlDbType.Int));
Cmd.Parameters["@UserID"].Value = Convert.ToInt32(hdUserID_Global.Value);
Cmd.ExecuteNonQuery();
}
else
{
}
Conn.Close();
Response.Redirect("/Library/Default2.aspx?FileID=" + Request["RootFileID"].ToString());
Response.End();
}
catch (Exception e){
Response.Write("An error occurred while saving: " + e);
Response.End();
}
}
我一直在掙扎了2個以上在那個日子裏，我不明白爲什麼按鈕不是第一次觸發，而只是從第二次開始。任何幫助將不勝感激。謝謝。
嘗試調試，看看哪些事件被解僱的第一個點擊按鈕，我懷疑這是Page_Load事件 –
在第一線webform.aspx即<％@ Page Language =「C＃」添加此屬性並查看它是否有效。 EnableEventValidation = 「假」。還要通過設置斷點來檢查代碼流。 –