![](/img/trans.png)
[英]Cannot add new row after set DataSource in gridview winform
[英]Add New Row in GridView cannot find reference
我有一個可編輯的GridView
但我也想添加新的行功能,所以我使用FooterTemplate
為所有可編輯字段制作了一個按鈕並設置CommandName="AddNew"
。 前端的一切看起來都符合預期,但 Add New Row 根本找不到txtGrantId
、 txtPotId
或txtBudget
並拋出System.NullReferenceException 'Object reference not set to an instance of an object.'
. 問題必須在后面的代碼中,但我也在附加前端。 數據源很長,但它確實調用了OnRowCommand="gvPotsMoneyGrants_RowCommand"
ASPX
<%--Primary Key LinkId--%>
<asp:TemplateField HeaderText="LinkId" SortExpression="LinkId">
<ItemTemplate>
<asp:Label ID="lblLinkId" runat="server" Text='<%# Eval("LinkId") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<%--GrantId--%>
<asp:TemplateField HeaderText="GrantId" SortExpression="GrantId">
<ItemTemplate>
<asp:Label ID="lblGrantIdMain" runat="server" Text='<%#Eval("GrantId") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtGrantId" runat="server" Text='<%#Bind("GrantId") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="inGrantId" Width="120px" runat="server" />
<asp:RequiredFieldValidator ID="vGrantId" runat="server" ControlToValidate="inGrantId" Text="?" ValidationGroup="VG5" />
</FooterTemplate>
</asp:TemplateField>
<%--PotId--%>
<asp:TemplateField HeaderText="PotId" SortExpression="PotId">
<ItemTemplate>
<asp:Label ID="lblPotIdMain" runat="server" Text='<%#Eval("PotId") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtPotId" runat="server" Text='<%#Bind("PotId") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="inPotId" Width="120px" runat="server" />
<asp:RequiredFieldValidator ID="vPotId" runat="server" ControlToValidate="inPotId" Text="?" ValidationGroup="VG5" />
</FooterTemplate>
</asp:TemplateField>
<%--Budget--%>
<asp:TemplateField HeaderText="Budget" SortExpression="Budget">
<ItemTemplate>
<asp:Label ID="lblBudgetMain" runat="server" Text='<%#Eval("Budget") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtBudget" runat="server" Text='<%#Bind("Budget") %>'></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="inBudget" Width="120px" runat="server" />
<asp:RequiredFieldValidator ID="vBudget" runat="server" ControlToValidate="inBudget" Text="?" ValidationGroup="VG5" />
</FooterTemplate>
</asp:TemplateField>
背后的代碼
protected void gvPotsMoneyGrants_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("AddNew"))
{
TextBox txtGrantId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("txtGrantId");
TextBox txtPotId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("txtPotId");
TextBox txtBudget = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("txtBudget");
string GrantId, PotId, Budget;
GrantId = txtGrantId.Text;
PotId = txtPotId.Text;
Budget = txtBudget.Text;
SqlCommand cmd = new SqlCommand();
cmd.Parameters.AddWithValue("GrantId", GrantId);
cmd.Parameters.AddWithValue("PotId", PotId);
cmd.Parameters.AddWithValue("Budget", Budget);
}
}
請嘗試下面的代碼。
protected void gvPotsMoneyGrants_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.Equals("AddNew"))
{
TextBox inGrantId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("inGrantId");
TextBox inPotId = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("inPotId");
TextBox inBudget = (TextBox)gvPotsMoneyGrants.FooterRow.FindControl("inBudget");
string GrantId, PotId, Budget;
GrantId = inGrantId.Text;
PotId = inPotId.Text;
Budget = inBudget.Text;
SqlCommand cmd = new SqlCommand();
cmd.Parameters.AddWithValue("GrantId", GrantId);
cmd.Parameters.AddWithValue("PotId", PotId);
cmd.Parameters.AddWithValue("Budget", Budget);
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.