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我現在正面臨着ASP.NET中的Repeater問題。當轉發器數據爲空時，ASP.NET頁面不能爲空
我將數據綁定到轉發器，該轉發器位於div可見性爲false並且顯示爲無的情況下。當我將數據綁定到中繼器，我得到兩種情況：
案例1：
當查詢返回一些數據。在這種情況下，我不會收到任何錯誤，並且每件事情都能正常運行。
CASE 2： 當查詢返回空白時。這次我得到頁面不能爲空錯誤。 （頁面不能爲空，請確保此操作正在ASP.NET請求的上下文中執行。）
請找到在該按鈕上運行的代碼單擊。
int RowCount = 0;
string cmd = "SELECT PrjB.Prj_ID, POB.ExpType as ExpType, TExp.Expenditure_ID AS ExpID, ISNULL(PrjB.Amount_Allocated, 0) AS
BudgetAllocated, ISNULL(POB.AmtAllocated, 0) "
+ "AS BudgetAvailedPO, ISNULL(NonPOB.AmtPaid, 0) AS BudgetAvailedNonPO FROM v_ProjectBudgetAllocated AS PrjB LEFT OUTER JOIN "
+ "v_POBudgetAllocated AS POB ON PrjB.Prj_ID = POB.Proj_ID AND PrjB.Expenditure_Type = POB.ExpType LEFT OUTER JOIN "
+ "v_NonPOBudgetAvailed AS NonPOB ON NonPOB.PrjID = PrjB.Prj_ID INNER JOIN T_Expenditure AS TExp ON POB.ExpType = TExp.Expenditure_Type "
+ "WHERE (PrjB.Prj_ID = '" + PrjID + "') ORDER BY ExpID";
DataSet ds = new DataSet();
SqlCommand selectCmd = new SqlCommand(cmd, myConnection);
SqlDataAdapter da = new SqlDataAdapter(selectCmd);
da.Fill(ds);
RowCount = ds.Tables[0].Rows.Count;
poStep3.Visible = true;
poStep3.Style["display"] = "block";
if (RowCount == 0)
{
poStep3.InnerHtml = "<b>Cannot Create Purchase Order. There is no budget allocated to this Project </b>";
}
else
{
PrjBudgetDetails.DataSource = ds;
PrjBudgetDetails.DataBind();
}
的ASPX代碼的股利是：
<div id="poStep3" class="formStep" runat="server" visible="false" style="display:none;">
<fieldset>
<span id="poDataEntryHead" class="formHead" runat="server">
Enter PO Details
</span>
<legend id="poDataEntryInstructions" class="frmInstructions" runat="server">
Please fill
all the texts in the fields. All fields are mandatory
</legend>
<div id="MessageDiv" runat="server" class="formMsg">
</div>
<div class="fieldgroup">
<asp:Label ID="LbPOID" runat="server" Text="PO ID:" CssClass="formFieldLabel" AssociatedControlID="POIDText">
</asp:Label>
<asp:TextBox ID="POIDText" name="PrjIDText" runat="server" CssClass="formInputField">
</asp:TextBox>
<asp:Label ID="POIDTextDsp" Font-Bold="true" runat="server" Text="" Visible="false"
CssClass="formFieldLabel" Style="display: none;">
</asp:Label>
<br />
</div>
<div class="fieldgroup">
<asp:Label ID="LbPOTitle" runat="server" Text="PO Title:" CssClass="formFieldLabel"
AssociatedControlID="POTitleText">
</asp:Label>
<asp:TextBox ID="POTitleText" name="POTitleText" runat="server" CssClass="formInputField">
</asp:TextBox>
<asp:Label ID="POTitleTextDsp" Font-Bold="true" runat="server" Text="" CssClass="formFieldLabel"
Visible="false" Style="display: none;">
</asp:Label>
<br />
</div>
<div class="fieldgroup">
<asp:Label ID="LbPODesc" runat="server" Text="PO Description:" CssClass="formFieldLabel" AssociatedControlID="PODescText">
</asp:Label>
<textarea id="PODescText" name="PODescText" cols="50" rows="6" runat="server" class="formInputField" />
<asp:Label ID="PODescTextDsp" Font-Bold="true" runat="server" Text="" CssClass="formFieldLabel"
Visible="false" Style="display: none;">
</asp:Label>
<br />
</div>
<div class="fieldgroup">
<asp:Label ID="LbPOIssueDateText" runat="server" Font-Bold="true" Text="PO Issue Date:" CssClass="formFieldLabel">
</asp:Label>
<asp:TextBox ID="POIssueDateText" name="POIssueDateText" runat="server" CssClass="formInputField">
</asp:TextBox>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
</asp:ToolkitScriptManager>
<asp:CalendarExtender ID="POIssueDateText_CalendarExtender" runat="server" TargetControlID="POIssueDateText"
Format="MM-dd-yyyy">
</asp:CalendarExtender>
<asp:Label ID="POIssueDateTextDsp" runat="server" Font-Bold="true" Text="" Visible="false" CssClass="formFieldLabel" Style="display: none;">
</asp:Label>
</div>
<div class="fieldgroup">
<asp:Label ID="LbprjBudgetInfoHead" runat="server" Font-Bold="true" Text="Project Budget data:" CssClass="formFieldLabel">
</asp:Label>
<span id="prjBudgetInfoHead" class="formHead" runat="server">
Project Budget Details
</span>
<span id="prjBudgetInfoInstructions" class="frmInstructions" runat="server">
The
current program budget status.
</span>
</div>
<br />
<div class="fieldgroup">
<table class="tblDispData">
<asp:Repeater ID="PrjBudgetDetails" runat="server" ClientIDMode="Static">
<HeaderTemplate>
<tr>
<th class="thDataDisp">
<asp:Label ID="LbExpType" runat="server" Text="Expenditure Type" CssClass="LbTblDataDisp"
Font-Bold="true">
</asp:Label>
</th>
<th class="thDataDisp">
<asp:Label ID="LbAllocatedBudget" runat="server" Text="Allocated Budget" CssClass="LbTblDataDisp"
Font-Bold="true">
</asp:Label>
</th>
<th class="thDataDisp">
<asp:Label ID="LbAvailedBudget" runat="server" Text="Available Budget" CssClass="LbTblDataDisp"
Font-Bold="true">
</asp:Label>
</th>
<th class="thDataDisp">
<asp:Label ID="LbRequestedBudget" runat="server" Text="Budget Requested" CssClass="LbTblDataDisp"
Font-Bold="true">
</asp:Label>
</th>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td class="tdDataDisp">
<asp:Label ID="ExpTypeText" runat="server" Text='<%#Eval("ExpType") %>' CssClass="LbTblDataDisp"AssociatedControlID="BudgetRequestedText">
</asp:Label>
</td>
<td class="tdDataDisp">
<asp:Label ID="BudgetAllocatedText" runat="server" Text=' <%#Eval("BudgetAllocated") %>' CssClass="LbTblDataDisp" AssociatedControlID="BudgetRequestedText">
</asp:Label>
</td>
<td class="tdDataDisp">
<asp:Label ID="BudgetAvailableText" runat="server" Text='<%#Convert.ToDouble(Eval("BudgetAllocated")) - Convert.ToDouble(Eval("BudgetAvailedPO")) - Convert.ToDouble(Eval("BudgetAvailedNonPO")) %>' CssClass="LbTblDataDisp" ClientIDMode="Static" AssociatedControlID="BudgetRequestedText">
</asp:Label>
</td>
<td class="tdDataDisp">
<asp:TextBox ID="BudgetRequestedText" runat="server" dataKey='<%#Eval("ExpID") %>' dataValue='<%#Eval("ExpType") %>' CssClass="tblDataInput" dataAmount='<%#Convert.ToDouble(Eval("BudgetAllocated")) Convert.ToDouble(Eval("BudgetAvailedPO")) - Convert.ToDouble(Eval("BudgetAvailedNonPO")) %>'></asp:TextBox>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
<tr>
<td colspan="3">
<span id="Span1" class="frmInstructions" runat="server">
Please enter zero(0) if not
requesting budget for any particular expenditure. The currency is INR.
</span>
</td>
<td>
<asp:Button ID="POSubmitBtn" runat="server" Text="Submit Budget" CssClass="formNext" ClientIDMode="Static" OnClick="POSubmitBtn_Click" />
<asp:Button ID="POGoToHomeBtn" runat="server" OnClick="POGoToHomeBtn_Click" Text="Home" CssClass="formNext" Visible="false" />
</td>
</tr>
</table>
</div>
</fieldset>
</div>
它已經幾個小時，因爲我在谷歌撞我的頭。看起來我被困在這裏，需要一些專家的幫助才能繼續前進。
在此先感謝。 -Himanshu
也許設置'poStep3.InnerHtml'是問題，因爲它包含服務器控件。改爲嘗試設置'poStep3.Visble = false'。 – canon 2014-08-28 13:18:34
順便說一句，應該避免內聯查詢來防止sql注入 – 2014-08-28 13:41:22