注意:我已经更新了这个问题的代码，使示例更清晰一些，并利用了下面 Karl Anderson 提供的示例代码。我也愿意接受其他方法来完成我需要完成的工作。
我正在创建一个表单，其中包含多个复选框，每个请求可能会或可能不会被利用。我正在尝试在 DetailsView 网格中的这些复选框下方创建一个按钮，如果需要全部选中它们，该按钮将只选中(而不是将选中和取消选中的按钮)复选框。从下面的代码中可以看出，复选框周围有多个文本框/BoundFields，其中包含此表单的各种类型的信息。没有增加“选中所有复选框”按钮的复杂性的表单在前端和写入数据库时没有任何问题。
使用我面临的当前障碍下方的代码不仅让按钮一次只选中所有复选框，而且在页面加载时克服此错误:
无法通过引用转换、装箱转换、拆箱转换、包装转换或空类型转换将类型“System.Web.UI.WebControls.TableCell”转换为“System.Web.UI.WebControls.CheckBox”
根据我对类似(但不完全)错误的研究，我需要将复选框转换为其他形式。我以前从未遇到过这种情况，我不仅在寻找教育引用，而且还在寻找某种关于如何解决转换部分的指针，但准确和当前(在过去几年内)如何解决转换部分的引用我可以解决按钮正确选中所有 19 个复选框的更大问题。
我在这里做错了什么，这是通过 DetailsView 获得我想要的结果的正确方法吗？我不仅想学习如何解决这个问题，还想学习这个挑战背后的理论/逻辑，这样我才能以正确的方式学习它。
aspx 代码。
(Note some cosmetic code for the details view has been omitted)
<%@ Page Title="Test Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="form2.aspx.cs" Inherits="form2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="FeaturedContent" Runat="Server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="MainContent" Runat="Server">
<asp:DetailsView ID="DetailsView" runat="server" AutoGenerateColumns="False" CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None">
<AlternatingRowStyle BackColor="White" />
<insert asp cosmetic gobbledy gook here>
<Fields>
<asp:BoundField DataField="Field_1" HeaderText="Ticket Number" SortExpression="Field_1" />
<asp:BoundField DataField="Field 2" HeaderText="Field 2" SortExpression="Field_2" />
<asp:BoundField DataField="Field_3" HeaderText="Field 3" SortExpression="Field_3" />
<asp:BoundField DataField="Field_4" HeaderText="Field 4" SortExpression="Field_4" />
<asp:BoundField DataField="Field_5" HeaderText="Field 5" SortExpression="Field_5" />
<asp:BoundField DataField="Field_6" HeaderText="Field 6" SortExpression="Field_6" />
<asp:BoundField DataField="Field_7" HeaderText="Field 7" SortExpression="Field_7" />
<asp:BoundField DataField="Field_8" HeaderText="Field 8" SortExpression="Field_8" />
<asp:BoundField DataField="Field_9" HeaderText="Field 9" SortExpression="Field_9" />
<asp:BoundField DataField="Field_10" HeaderText="Field 10" SortExpression="Field_10" />
<asp:CheckBoxField DataField="Check_Box_1" HeaderText="Check Box 1" SortExpression="Check_Box_1" />
<asp:CheckBoxField DataField="Check_Box_2" HeaderText="Check Box 2" SortExpression="Check_Box_2" />
<asp:CheckBoxField DataField="Check_Box_3" HeaderText="Check Box 3" SortExpression="Check_Box_3" />
<asp:CheckBoxField DataField="Check_Box_4" HeaderText="Check Box 4" SortExpression="Check_Box_4" />
<asp:CheckBoxField DataField="Check_Box_5" HeaderText="Check Box 5" SortExpression="Check_Box_5" />
<asp:CheckBoxField DataField="Check_Box_6" HeaderText="Check Box 6" SortExpression="Check_Box_6" />
<asp:CheckBoxField DataField="Check_Box_7" HeaderText="Check Box 7" SortExpression="Check_Box_7" />
<asp:CheckBoxField DataField="Check_Box_8" HeaderText="Check Box 8" SortExpression="Check_Box_8" />
<asp:CheckBoxField DataField="Check_Box_9" HeaderText="Check Box 9" SortExpression="Check_Box_9" />
<asp:CheckBoxField DataField="Check_Box_10" HeaderText="Check Box 10" SortExpression="Check_Box_10" />
<asp:CheckBoxField DataField="Check_Box_11" HeaderText="Check Box 11" SortExpression="Check_Box_11" />
<asp:CheckBoxField DataField="Check_Box_12" HeaderText="Check Box 12" SortExpression="Check_Box_12" />
<asp:CheckBoxField DataField="Check_Box_13" HeaderText="Check Box 13" SortExpression="Check_Box_13" />
<asp:CheckBoxField DataField="Check_Box_14" HeaderText="Check Box 14" SortExpression="Check_Box_14" />
<asp:CheckBoxField DataField="Check_Box_15" HeaderText="Check Box 15" SortExpression="Check_Box_15" />
<asp:CheckBoxField DataField="Check_Box_16" HeaderText="Check Box 16" SortExpression="Check_Box_16" />
<asp:CheckBoxField DataField="Check_Box_17" HeaderText="Check Box 17" SortExpression="Check_Box_17" />
<asp:CheckBoxField DataField="Check_Box_18" HeaderText="Check Box 18" SortExpression="Check_Box_18" />
<asp:CheckBoxField DataField="Check_Box_19" HeaderText="Check Box 19" SortExpression="Check_Box_19" />
<asp:ButtonField ButtonType="Button" CommandName="btnSelectAll" Text="Select/Check All Servers"
<asp:BoundField DataField="Field_11" HeaderText="Field 11" SortExpression="Field_11" />
<asp:BoundField DataField="Field_12" HeaderText="Field 12" SortExpression="Field_12" />
<asp:BoundField DataField="Field_13" HeaderText="Field 13" SortExpression="Field_13" />
<asp:CommandField ButtonType="Button" NewText="CreateRecord" ShowInsertButton="True" />
</Fields>
<more asp non essential cosmetic gobbledy gook>
</asp:DetailsView>
<asp:SqlDataSource ID="SqlDataSource1" ConnectionString="<%$ ConnectionStrings:test_form_connect %>" runat="server" InsertCommand="INSERT INTO [test].[detailsview_test_form] ([Field_1], [Field_2], [Field_3], [Field_4], [Field_5], [Field_6], [Field_7], [Field_8], [Field_9], [Field_10], [Check_Box_1], [Check_Box_2], [Check_Box_3], [Check_Box_4], [Check_Box_5], [Check_Box_6], [Check_Box_7], [Check_Box_8], [Check_Box_9], [Check_Box_10], [Check_Box_11], [Check_Box_12], [Check_Box_13], [Check_Box_14], [Check_Box_15], [Check_Box_16], [Check_Box_17], [Check_Box_18], [Check_Box_19], [Field_11], [Field_12], [Field_13]) VALUES (@Field_1, @Field_2, @Field_3, @Field_4, @Field_5, @Field_6, @Field_7, @Field_8, @Field_9, @Field_10, @Check_Box_1, @Check_Box_2, @Check_Box_3, @Check_Box_4, @Check_Box_5, @Check_Box_6, @Check_Box_7, @Check_Box_8, @Check_Box_9, @Check_Box_10, @Check_Box_11, @Check_Box_12, @Check_Box_13, @Check_Box_14, @Check_Box_15, @Check_Box_16, @Check_Box_17, @Check_Box_18, @Check_Box_19, @Field_11, @Field_12, @Field_13) ">
<InsertParameters>
<asp:Parameter Name="Field_1" />
<asp:Parameter Name="Field_2" />
<asp:Parameter Name="Field_3" />
<asp:Parameter Name="Field_4" />
<asp:Parameter Name="Field_5" />
<asp:Parameter Name="Field_6" />
<asp:Parameter Name="Field_7" />
<asp:Parameter Name="Field_8" />
<asp:Parameter Name="Field_9" />
<asp:Parameter Name="Field_10" />
<asp:Parameter Name="Check_Box_1" />
<asp:Parameter Name="Check_Box_2" />
<asp:Parameter Name="Check_Box_3" />
<asp:Parameter Name="Check_Box_4" />
<asp:Parameter Name="Check_Box_5" />
<asp:Parameter Name="Check_Box_6" />
<asp:Parameter Name="Check_Box_7" />
<asp:Parameter Name="Check_Box_8" />
<asp:Parameter Name="Check_Box_9" />
<asp:Parameter Name="Check_Box_10" />
<asp:Parameter Name="Check_Box_11" />
<asp:Parameter Name="Check_Box_12" />
<asp:Parameter Name="Check_Box_13" />
<asp:Parameter Name="Check_Box_14" />
<asp:Parameter Name="Check_Box_15" />
<asp:Parameter Name="Check_Box_16" />
<asp:Parameter Name="Check_Box_17" />
<asp:Parameter Name="Check_Box_18" />
<asp:Parameter Name="Check_Box_19" />
<asp:Parameter Name="Field_11" />
<asp:Parameter Name="Field_12" />
<asp:Parameter Name="Field_13" />
</InsertParameters>
</asp:SqlDataSource>
</asp:Content>
.....和cs代码:
using System;
using System.Configuration;
using System.Collections;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class form2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DetailsView1_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
{
foreach (Details
if (e.CommandName == "btnSelectAll")
{
DetailsViewRow row = DetailsView1.Rows[9];
(row.Cells[10] as CheckBox).Checked = true;
DetailsViewRow row1 = DetailsView1.Rows[10];
(row1.Cells[11] as CheckBox).Checked = true;
DetailsViewRow row2 = DetailsView1.Rows[11];
(row.Cells[12] as CheckBox).Checked = true;
DetailsViewRow row3 = DetailsView1.Rows[12];
(row.Cells[13] as CheckBox).Checked = true;
DetailsViewRow row4 = DetailsView1.Rows[13];
(row.Cells[14] as CheckBox).Checked = true;
DetailsViewRow row5 = DetailsView1.Rows[14];
(row.Cells[15] as CheckBox).Checked = true;
DetailsViewRow row6 = DetailsView1.Rows[15];
(row.Cells[16] as CheckBox).Checked = true;
DetailsViewRow row7 = DetailsView1.Rows[16];
(row.Cells[17] as CheckBox).Checked = true;
DetailsViewRow row8 = DetailsView1.Rows[17];
(row.Cells[18] as CheckBox).Checked = true;
DetailsViewRow row9 = DetailsView1.Rows[18];
(row.Cells[19] as CheckBox).Checked = true;
DetailsViewRow row10 = DetailsView1.Rows[19];
(row.Cells[20] as CheckBox).Checked = true;
DetailsViewRow row11 = DetailsView1.Rows[20];
(row.Cells[21] as CheckBox).Checked = true;
DetailsViewRow row12 = DetailsView1.Rows[21];
(row.Cells[22] as CheckBox).Checked = true;
DetailsViewRow row13 = DetailsView1.Rows[22];
(row.Cells[23] as CheckBox).Checked = true;
DetailsViewRow row14 = DetailsView1.Rows[23];
(row.Cells[24] as CheckBox).Checked = true;
DetailsViewRow row15 = DetailsView1.Rows[24];
(row.Cells[25] as CheckBox).Checked = true;
DetailsViewRow row16 = DetailsView1.Rows[25];
(row.Cells[26] as CheckBox).Checked = true;
DetailsViewRow row17 = DetailsView1.Rows[26];
(row.Cells[27] as CheckBox).Checked = true;
DetailsViewRow row18 = DetailsView1.Rows[27];
(row.Cells[28] as CheckBox).Checked = true;
DetailsViewRow row19 = DetailsView1.Rows[28];
(row.Cells[29] as CheckBox).Checked = true;
}
}
}
最佳答案
您通过引用转换、装箱转换、拆箱转换、包装转换或空类型转换获得“'System.Web.UI.WebControls.CheckBox'”的原因是因为您试图将 Cell 转换为复选框。
请注意，我在 Rows Cell 的 ControlCollection 中找到了 CheckBox 控件。
下面是经过测试的示例代码:
表格:
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" OnItemCommand="DetailsView1_ItemCommand">
<AlternatingRowStyle BackColor="White" />
<Fields>
<asp:ButtonField ButtonType="Button" CommandName="btnSelectAll" Text="Select/Check All Servers" />
<asp:ButtonField ButtonType="Button" CommandName="btnEdit" Text="Edit" />
<asp:ButtonField ButtonType="Button" CommandName="btnCancel" Text="Cancel" />
<asp:ButtonField ButtonType="Button" CommandName="btnSave" Text="Save" />
<asp:CommandField ButtonType="Button" NewText="CreateRecord" ShowInsertButton="True" />
</Fields>
</asp:DetailsView>
代码隐藏:
DataTable m_table = null;
public DataTable table
{
get
{
if (ViewState["m_table"] != null)
return (DataTable)ViewState["m_table"];
else
return null;
}
set
{
ViewState["m_table"] = value;
}
}
public static T FindControl<T>(ControlCollection controls)
{
for (int i = 0; i < controls.Count; i++)
{
if (controls[i] is T)
return (T)(object)controls[i];
}
return default(T);
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
table = new DataTable();
DataColumn col1 = new DataColumn("Field_1");
DataColumn col11 = new DataColumn("Check_Box_1");
DataColumn col12 = new DataColumn("Check_Box_2");
DataColumn col13 = new DataColumn("Check_Box_3");
col1.DataType = System.Type.GetType("System.String");
col11.DataType = System.Type.GetType("System.Boolean");
col12.DataType = System.Type.GetType("System.Boolean");
col13.DataType = System.Type.GetType("System.Boolean");
table.Columns.Add(col1);
table.Columns.Add(col11);
table.Columns.Add(col12);
table.Columns.Add(col13);
DataRow row = table.NewRow();
row[col1] = "1";
row[col11] = false;
row[col12] = false;
row[col13] = false;
table.Rows.Add(row);
DetailsView1.DataSource = table;
DetailsView1.DataBind();
}
}
protected void DetailsView1_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
{
if (e.CommandName == "btnSelectAll")
{
foreach (DetailsViewRow row in DetailsView1.Rows)
{
for (int i = 0; i < row.Cells.Count; i++)
{
CheckBox cb = FindControl<CheckBox>(row.Cells[i].Controls);
if (cb != null)
{
cb.Checked = true;
}
}
}
}
if (e.CommandName == "btnSave")
{
int j = 0;
foreach (DetailsViewRow row in DetailsView1.Rows)
{
for (int i = 0; i < row.Cells.Count; i++)
{
TextBox tb = FindControl<TextBox>(row.Cells[i].Controls);
if (tb != null)
{
table.Rows[0][j] = tb.Text;
}
CheckBox cb = FindControl<CheckBox>(row.Cells[i].Controls);
if (cb != null)
{
table.Rows[0][j] = cb.Checked;
}
}
j++;
}
DetailsView1.ChangeMode(DetailsViewMode.ReadOnly);
DetailsView1.DataSource = table;
DetailsView1.DataBind();
}
if (e.CommandName == "btnEdit")
{
DetailsView1.ChangeMode(DetailsViewMode.Edit);
DetailsView1.DataSource = table;
DetailsView1.DataBind();
}
if (e.CommandName == "btnCancel")
{
DetailsView1.ChangeMode(DetailsViewMode.ReadOnly);
DetailsView1.DataSource = table;
DetailsView1.DataBind();
}
}
关于c# - 在 DetailsView 错误中选择所有复选框按钮，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17375874/