<label>Date</label>
<asp:TextBox ID="txtDate" runat="server" CssClass="entry"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" CssClass="validator"
ErrorMessage="A date is required." ControlToValidate="txtDate"></asp:RequiredFieldValidator>
<asp:CompareValidator ID="dateValidator" CssClass="validator" runat="server" Type="Date" Operator="DataTypeCheck" ControlToValidate="txtDate"
ErrorMessage="Please enter a valid date"></asp:CompareValidator>
<br />
<label>Description</label>
<asp:TextBox ID="txtMealDescription" runat="server" CssClass="entry" Width="500px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" CssClass="validator"
ErrorMessage="Please describe the meal." ControlToValidate="txtMealDescription"></asp:RequiredFieldValidator>
<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Meal description cannot be longer than 250 characters. Please try again."
ControlToValidate="txtMealDescription" OnServerValidate="CustomValidator1_ServerValidate" CssClass="validator"></asp:CustomValidator>
<br />
<label>Type</label>
<asp:DropDownList ID="ddlMealType" runat="server" CssClass="entry" >
<asp:ListItem Text="Breakfast" Value="Breakfast"></asp:ListItem>
<asp:ListItem Text="Dinner" Value="Dinner"></asp:ListItem>
</asp:DropDownList>
<br />
<asp:Button ID="btnAdd" runat="server" Text="Add New Meal" OnClick="btnAdd_Click" />
<br />
<br />
<asp:Label ID="lblError" runat="server" EnableViewState="False" CssClass="error"></asp:Label>
<asp:GridView ID="GridView1"
runat="server"
CellPadding="4"
DataSourceID="SqlDataSource1"
AutoGenerateColumns="False"
DataKeyNames="MealID,Date,MealDescription,MealType"
OnRowUpdated="GridView1_RowUpdate"
OnRowDeleted="GridView1_RowDelete" ForeColor="#333333" GridLines="None">
<EditRowStyle BackColor="#2461BF" />
<FooterStyle BackColor="#507CD1" ForeColor="White" Font-Bold="True" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#EFF3FB" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#F5F7FB" />
<SortedAscendingHeaderStyle BackColor="#6D95E1" />
<SortedDescendingCellStyle BackColor="#E9EBEF" />
<SortedDescendingHeaderStyle BackColor="#4870BE" />
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:BoundField DataField="MealID" HeaderText="ID" Visible="false" />
<asp:TemplateField HeaderText="Date">
<ItemTemplate>
<asp:Label ID="lblGridDate" runat="server" Text='<%# Bind("Date", "{0:M/dd/yyy}") %>' Width="75px"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtGridDate" runat="server" Text='<%# Bind("Date", "{0:M/dd/yyy}") %>' Width="75px"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Meal Description">
<ItemTemplate>
<asp:Label ID="lblGridMealDescription" runat="server" Text='<%# Bind("MealDescription") %>' Width="500px"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtGridMealDescription" runat="server" Text='<%# Bind("MealDescription") %>' Width="500px"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Meal Type">
<ItemTemplate>
<asp:Label ID="lblGridMealType" runat="server" Text='<%# Bind("MealType") %>' Width="100px"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlGridMealType" runat="server" SelectedValue='<%# Bind("MealType") %>' Width="100px">
<asp:ListItem Text="Breakfast" Value="Breakfast"></asp:ListItem>
<asp:ListItem Text="Dinner" Value="Dinner"></asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:CommandField ButtonType="Button" ShowEditButton="true" HeaderText="Edit" ItemStyle-Width="75px" ItemStyle-HorizontalAlign="Center"/>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:Button ID="btnDelete" runat="server" OnClientClick="return confirm('Are you sure you want to delete this record?');"
CommandName="Delete" Text="Delete" Width="50px"></asp:button>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<asp:SqlDataSource ID="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:CampRandolphMenuTwoConnectionString %>"
InsertCommand="sp_ins_MenuItems" InsertCommandType="StoredProcedure"
SelectCommand="sp_sel_MenuItems" SelectCommandType="StoredProcedure"
UpdateCommand="sp_edit_MenuItems" UpdateCommandType="StoredProcedure"
DeleteCommand="sp_del_MenuItems" DeleteCommandType="StoredProcedure">
<InsertParameters>
<asp:Parameter Name="Date" DbType="Date" />
<asp:Parameter Name="MealDescription" Type="String" />
<asp:Parameter Name="MealType" Type="String" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="MealID" Type="Int32" />
<asp:Parameter Name="date" DbType="Date" />
<asp:Parameter Name="MealDescription" Type="String" />
<asp:Parameter Name="MealType" Type="String" />
</UpdateParameters>
<DeleteParameters>
<asp:Parameter Name="MealID" Type="Int32" />
</DeleteParameters>
</asp:SqlDataSource>
以上是我的代码。一切都在减去更新部分。它没有崩溃，也没有做任何事情。这就是问题所在。新值将在数据库中更新。下面的代码是存储过程
ALTER procedure [dbo].[sp_edit_MenuItems]
@MealID int,
@date date,
@MealDescription varchar(250),
@MealType varchar(10)
as
begin
UPDATE Menu
SET
date = @date,
MealDescription = @MealDescription,
MealType = @MealType
WHERE
(MealID = @MealID)
END
任何建议都将不胜感激。谢谢。此外，当尝试更新文本框所需的字段验证器时，用于插入。不知道为什么会这样。
代码背后：
public partial class EditMenuTwo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ddlMealType.Items.Insert(0, new ListItem(String.Empty, String.Empty));
ddlMealType.SelectedIndex = 0;
}
protected void btnAdd_Click(object sender, EventArgs e)
{
SqlDataSource1.InsertParameters["Date"].DefaultValue = txtDate.Text;
SqlDataSource1.InsertParameters["MealDescription"].DefaultValue = txtMealDescription.Text;
SqlDataSource1.InsertParameters["MealType"].DefaultValue = ddlMealType.Text;
try
{
SqlDataSource1.Insert();
txtDate.Text = "";
txtMealDescription.Text = "";
ddlMealType.Text = "";
}
catch (Exception ex)
{
lblError.Text = "A database error has occcurred. <br /><br />" +
"Message: " + ex.Message;
}
}
protected void GridView1_RowUpdate(object sender, GridViewUpdatedEventArgs e)
{
if (e.Exception != null)
{
lblError.Text = "A database error has occurred.<br /><br />" +
"Message: " + e.Exception.Message;
e.ExceptionHandled = true;
e.KeepInEditMode = true;
}
else if (e.AffectedRows == 0)
{
lblError.Text = "Another user may have updated that category." +
"<br />Please try again.";
}
}
protected void GridView1_RowDelete(object sender, GridViewDeletedEventArgs e)
{
if (e.Exception != null)
{
lblError.Text = "A database error has occurred.<br /><br />" +
"Message: " + e.Exception.Message;
e.ExceptionHandled = true;
}
else if (e.AffectedRows == 0)
{
lblError.Text = "Another user may have updated that category." +
"<br />Please try again.";
}
}
protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
args.IsValid = (txtMealDescription.Text.Length <= 250);
}
}
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
DataTable dt = (DataTable)Session["Menu"];
GridViewRow row = GridView1.Rows[e.RowIndex];
dt.Rows[row.DataItemIndex]["MenuId"] = ((TextBox)(row.Cells[1].Controls[0])).Text;
dt.Rows[row.DataItemIndex]["Date"] = ((TextBox)(row.Cells[2].Controls[0])).Text;
dt.Rows[row.DataItemIndex]["MealDescription"] = ((TextBox)(row.Cells[3].Controls[0])).Text;
dt.Rows[row.DataItemIndex]["MealType"] = ((DropDownList)(row.Cells[4].Controls[0])).Text;
GridView1.EditIndex = -1;
GridView1.DataBind();
}
现在收到以下错误：
第93行：dt.Rows [row.DataItemIndex] [“MenuId”] =（（TextBox）（row.Cells [1] .Controls [0]））。Text
答案 0 :(得分：1)
更新方法缺少的内容示例：
protected void TaskGridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
//Retrieve the table from the session object.
DataTable dt = (DataTable)Session["TaskTable"];
//Update the values.
GridViewRow row = TaskGridView.Rows[e.RowIndex];
dt.Rows[row.DataItemIndex]["Id"] = ((TextBox)(row.Cells[1].Controls[0])).Text;
dt.Rows[row.DataItemIndex]["Description"] = ((TextBox)(row.Cells[2].Controls[0])).Text;
dt.Rows[row.DataItemIndex]["IsComplete"] = ((CheckBox)(row.Cells[3].Controls[0])).Checked;
//Reset the edit index.
TaskGridView.EditIndex = -1;
//Bind data to the GridView control.
BindData();
}