当我点击Grid中的EDIT按钮时，它会使所有字段都可编辑并提供两个选项（更新和取消）。在这个网格中，有两个下拉列表，3个日历和一些文本框。如果我单击更新，则数据库中的所有文本框值都会更新，但数据库中的所有其他字段（下拉列表和日历）值将自动为NULL。
以下是主页GridView代码：
<asp:GridView ID="GridView1" runat="server" CellPadding="5" ForeColor="#333333" width="1000px"
GridLines="None" OnPageIndexChanging="gridView_PageIndexChanging"
AllowSorting="True" OnSorting="gridView_Sorting" AutoGenerateColumns="False" OnRowUpdating="GridView1_RowUpdating"
BorderStyle="Outset" CellSpacing="1" Font-Names="Cambria"
Font-Size="Small" AllowPaging="True" ShowFooter="True"
ShowHeaderWhenEmpty="True"
DataSourceID="SqlDataSource1" onselectedindexchanged="GridView1_SelectedIndexChanged"
>
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:BoundField DataField="case_number" HeaderText="Case Number"
SortExpression="case_number" />
<asp:BoundField DataField="case_name" HeaderText="Case Name"
SortExpression="case_name" />
<asp:BoundField DataField="Case_Type_Text" HeaderText="Case Type"
SortExpression="Case_Type_Text" />
<asp:TemplateField HeaderText="Case Status" SortExpression="Case_Status_Text">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList3" runat="server"
DataSourceID="SqlDataSource3" DataTextField="Case_Status_Text" DataValueField="Case_Status_Text"
SelectedValue='<%# Bind("Case_Status_Text") %>'>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Case_Status_Text") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="assigned_date" HeaderText="Assigned Date"
SortExpression="assigned_date" DataFormatString="{0:d}" />
<asp:BoundField DataField="assigned_to" HeaderText="Assigned To"
SortExpression="assigned_to" />
<asp:TemplateField HeaderText="Date Withdrawn" SortExpression="date_withdrawn">
<EditItemTemplate>
<cc1:DatePicker ID="DatePicker5" runat="server" />
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label4" runat="server"
Text='<%# Bind("date_withdrawn", "{0:d}") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date Delivered" SortExpression="date_delivered">
<EditItemTemplate>
<cc1:DatePicker ID="DatePicker7" runat="server"
/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label6" runat="server"
Text='<%# Bind("date_delivered", "{0:d}") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="QC By" SortExpression="qc_by">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList5" runat="server"
DataSourceID="SqlDataSource4" DataTextField="User_Name" DataValueField="User_Name"
SelectedValue='<%# Bind("qc_by") %>'>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("qc_by") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="QC Date" SortExpression="qc_date">
<EditItemTemplate>
<cc1:DatePicker ID="DatePicker6" runat="server"
/>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label5" runat="server" Text='<%# Bind("qc_date", "{0:d}") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Additional Notes">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server"
Text='<%# Bind("additional_notes") %>' TextMode="MultiLine"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("additional_notes") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowEditButton="True" ButtonType="Button"
CausesValidation="False" />
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:con %>"
ProviderName="<%$ ConnectionStrings:con.ProviderName %>"
SelectCommand="SELECT * FROM [View_Intakesheet]"
UpdateCommand="UPDATE intakesheet SET case_number = @case_number, case_name=@case_name, Case_Type=@case_type, Case_Status = @case_status, assigned_date = @assigned_date, assigned_to = @assigned_to, date_withdrawn= @date_withdrawn, date_delivered= @date_delivered, qc_by = @qc_by, qc_date=@qc_date, additional_notes = @additional_notes WHERE (case_number = @case_number)">
<UpdateParameters>
<asp:Parameter Name="case_number"/>
<asp:Parameter Name="case_name" />
<asp:Parameter Name="case_type" />
<asp:Parameter Name="case_status" />
<asp:Parameter Name="assigned_date" Type="DateTime" />
<asp:Parameter Name="assigned_to" />
<asp:Parameter Name="date_withdrawn" Type="DateTime" />
<asp:Parameter Name="date_delivered" Type="DateTime" />
<asp:Parameter Name="qc_by" />
<asp:Parameter Name="qc_date" Type="DateTime" />
<asp:Parameter Name="additional_notes" />
</UpdateParameters>
</asp:SqlDataSource>
</td>
</tr>
以下是Update事件::
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
DropDownList ct = (DropDownList)row.FindControl("case_type");
DropDownList cs = (DropDownList)row.FindControl("case_status");
con.Open();
SqlCommand cmd = new SqlCommand("UPDATE intakesheet SET case_number = @case_number, case_name = @case_name, Case_Type = Case_Type, Case_Status = Case_Status, assigned_date = assigned_date, assigned_to = assigned_to, date_withdrawn= date_withdrawn, date_delivered= date_delivered, qc_by = qc_by, qc_date=qc_date, additional_notes = additional_notes WHERE (case_number = case_number)", immigration);
cmd.ExecuteNonQuery();
GridView1.EditIndex = -1;
con.Close();
bind();
}
public void bind()
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter("select * from intakesheet", con);
DataSet ds = new DataSet();
da.Fill(ds, "intakesheet");
//GridView1.DataSource = ds.Tables[0].DefaultView;
GridView1.DataBind();
con.Close();
}
答案 0 :(得分：1)
SqlCommand cmd = new SqlCommand("UPDATE intakesheet SET case_number = @case_number, case_name = @case_name, Case_Type = Case_Type, Case_Status = Case_Status, assigned_date = assigned_date, assigned_to = assigned_to, date_withdrawn= date_withdrawn, date_delivered= date_delivered, qc_by = qc_by, qc_date=qc_date, additional_notes = additional_notes WHERE (case_number = case_number)", immigration);
更改此行
主要是这些问题
更新查询中的 Case_Type = Case_Type, Case_Status = Case_Status
DropDownList ct = (DropDownList)row.FindControl("case_type");
DropDownList cs = (DropDownList)row.FindControl("case_status")
如果要绑定其值，则发送ct.SelectedIndex.value
如果要发送选定的索引 然后 发送 dt.SelectedText
像
Case_Type = ct.SelectedItem.Text, Case_Status = cs.SelectedItem.Text
检查此行
DropDownList cs = (DropDownList)row.FindControl("DropDownList3")
类似地为案例类型
提供正确的id在上面的行中，您传递了下拉列表的ID，您应该发送其所选索引的选定值
更改
SqlCommand cmd = new SqlCommand（“UPDATE intakesheet SET case_number = @case_number，case_name = @case_name，Case_Type = Case_Type，Case_Status = Case_Status，assigned_date = assigned_date，assigned_to = assigned_to，date_withdrawn = date_withdrawn，date_delivered = date_delivered，qc_by = qc_by ，qc_date = qc_date，additional_notes = additional_notes WHERE（case_number = case_number）“，移民）;
cmd.parameters.add("@case_number",sqldbtype.nvarchar).value = case_number // the string variable of case number
为其他参数做类似的事情
答案 1 :(得分：0)
我还遇到了一个没有更新的GridView的问题。在GridView的RowUpdating事件中检查e.Newvalues Dictionary显示记录的旧值被发送到数据库UPDATE查询。 DataKeyNames不是我的问题;我把它设置正确。我的SELECT查询的WHERE子句引用了一个针对我的表单上的TextBox的控件参数。我无意中将此文本框的EnableViewState设置为＆＃34; False＆＃34;。因此，GridView在UPDATE发生之前重新绑定。将TextBox上的EnableViewState设置为＆＃34; True＆＃34;解决了这个问题。以下是查看UPDATE参数的代码：
Protected Sub MyGridView_RowUpdating _
(sender As Object, e As System.Web.UI.WebControls.GridViewUpdateEventArgs) _
Handles MyGridView.RowUpdating
' Inspect the parameters being sent to the database for an ASP NET GridView UPDATE.
Dim I As Integer
I = 0
For Each MVO As System.Collections.DictionaryEntry In e.OldValues
If MVO.Value Is DBNull.Value OrElse MVO.Value Is Nothing Then
Debug.Print(I.ToString + ": " + MVO.Key + " Value: ")
Else
Debug.Print(I.ToString + ": " + MVO.Key + " Value: " + MVO.Value.ToString)
End If
I += 1
Next MVO
I = 0
For Each MVN As System.Collections.DictionaryEntry In e.NewValues
If MVN.Value Is DBNull.Value OrElse MVN.Value Is Nothing Then
Debug.Print(I.ToString + ": " + MVN.Key + " Value: ")
Else
Debug.Print(I.ToString + ": " + MVN.Key + " Value: " + MVN.Value.ToString)
End If
I += 1
Next MVN
End Sub