循环可变化的集合 数组 datatable 等 || c# winfrom DataGridView 动态UI下
Gif演示分解步骤
1，使用组件DataGridView
2，使用DataSource来控制表格展示的数据来源（注意:来源需要是DataTable类型）
3，需要用到异步线程。如果是不控制数据源的话，需要使用UI安全线程；（使用Control.Invoke或Control.BeginInvoke方法）
4，DataGridView的列如果设置图片，尽量代码设置
5，DataTable类型也是可以使用LINQ的，参考：AsEnumerable
完整代码
using Newtonsoft.Json;
using Sunny.UI.Win32;
using Sunny.UI;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using WinApp.i18n;
using WinApp.Until;
using WinApp.ViewModel;
using static System.Net.Mime.MediaTypeNames;
using Microsoft.EntityFrameworkCore.Metadata.Internal;
using System.Security.Cryptography;
namespace WinApp.View
{
public partial class DownloadList : UserControl
{
/// <summary>
/// 开启任务的开关（作用：禁止重复启动任务）
/// </summary>
private static bool _taskSwitch = true;
/// <summary>
/// 任务中的小开关（作用：如果被外部干涉,则进行退出执行任务内容）
/// </summary>
private static bool _taskCondition = true;
public DataTable _table;
List<DownloadListDto> _mainList;
public UILabel _lbNotData;
public DownloadList()
{
InitializeComponent();
var mainTitle = string.Empty;
mainTitle = Language.GetLang("downloadTitle1");
mainTitle += "\r" + Language.GetLang("downloadTitle2");
this.uiPanel1.Text = mainTitle;
uiDataGridView1.ColumnHeadersVisible = false;
uiDataGridView1.RowTemplate.Height = 65;
uiDataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None;
_lbNotData = new UILabel();
_lbNotData.Text = "No more data available";
_lbNotData.Cursor = Cursors.Hand;
_lbNotData.TextAlign = ContentAlignment.MiddleCenter;
_lbNotData.Location = new Point(450, 50);
_lbNotData.Width = 200;
_lbNotData.Visible = false;
this.uiPanel2.Controls.Add(_lbNotData);
}
private void DownloadList_Load(object sender, EventArgs e)
{
QueryData();
}
public void SetCondition(bool setValue)
{
_taskCondition = setValue;
}
public async Task DownloadAllAsync()
{
if (_taskSwitch)
{
if (_table.Rows.Count <= 0)
{
UIMessageDialog.ShowMessageDialog("No more data available", UILocalize.WarningTitle, showCancelButton: false, UIStyle.Orange, false);
return;
}
//已经执行,请勿重复执行；
_taskSwitch = false;
foreach (DataRow row in _table.Rows)
{
row["Status"] = "2";//设置为下载中的状态
uiDataGridView1.Refresh();
}
while (_table.Rows.Count > 0 && _taskCondition)
{//如果列表有数据就一直循环进行下载删除
var firstRow = _table.Rows;
if (firstRow == null)
{//第一个元素等于NULL
return;
}
for (int j = 0; j <= 100; j++)//模拟进度条
{
if (_taskCondition)
{//如果没有暂停
await Task.Delay(10); // wait for 100 milliseconds
firstRow["DownloadProgress"] = j.ToString();
}
else
{//暂停
firstRow["Status"] = "1";
}
}
if (_taskCondition)
{
// 获取当前行的数据行
var _Id = (int)firstRow["Id"];
// 使用Linq查询匹配的行
var rowsToDelete = _table.AsEnumerable().FirstOrDefault(row => row.Field<int>("Id") == _Id);
_table.Rows.Remove(rowsToDelete);
}
}
//foreach (DataRow row in _table.Rows)
//{
// row["Status"] = "2";
// for (int j = 0; j <= 100; j++)
// {
// if (_taskCondition)
// {
// await Task.Delay(10); // wait for 100 milliseconds
// row["DownloadProgress"] = j.ToString();
// }
// else
// {
// row["Status"] = "1";
// }
// }
// // 获取当前行的数据行
// var _Id = (int)row["Id"];
// // 使用Linq查询匹配的行
// var rowsToDelete = _table.AsEnumerable().FirstOrDefault(row => row.Field<int>("Id") == _Id);
// _table.Rows.Remove(rowsToDelete);
//}
//foreach (var item in _mainList)
//{
// item.Status = 2;
// uiDataGridView1.Refresh();
// for (int i = 0; i < 100; i++)
// {
// if (_taskCondition)
// {
// await Task.Delay(100); // wait for 100 milliseconds
// item.DownloadProgress = i.ToString();
// uiDataGridView1.Refresh();
// }
// else
// {
// item.Status = 1;
// return;
// }
// }
//}
//执行完毕，则可以重新执行
_taskSwitch = true;
}
else
{
//因为此次没有执行，下次允许执行；
_taskSwitch = true;
return;
}
}
public void PauseAll()
{
SetCondition(false);
//获取所有已经开始的数据
var pauseList = _table.AsEnumerable().Where(row => row.Field<int>("Status") == 2);
foreach (DataRow item in pauseList)
{
item["Status"] = "1";
uiDataGridView1.Refresh();
}
}
public void DeleteAll()
{
SetCondition(false);
// 清除所有行
_table.Clear();
uiDataGridView1.Refresh();
this.uiDataGridView1.Refresh();
}
public void QueryData()
{
LoadingHelper.ShowLoadingScreen();
_mainList = new List<DownloadListDto>();
_mainList.Add(new DownloadListDto()
{
Id = 1,
Title = "A1" + Environment.NewLine + "B1",
Status = 1,
DownloadProgress = "0"
});
_mainList.Add(new DownloadListDto()
{
Id = 2,
Title = "A2" + Environment.NewLine + "B2",
Status = 1,
DownloadProgress = "0"
});
_mainList.Add(new DownloadListDto()
{
Id = 3,
Title = "A3" + Environment.NewLine + "B3",
Status = 1,
DownloadProgress = "0"
});
_mainList.Add(new DownloadListDto()
{
Id = 4,
Title = "A4" + Environment.NewLine + "B4",
Status = 1,
DownloadProgress = "0"
});
_mainList.Add(new DownloadListDto()
{
Id = 5,
Title = "A5" + Environment.NewLine + "B5",
Status = 1,
DownloadProgress = "0"
});
_table = _mainList.ToDataTable();
this.uiDataGridView1.DataSource = _table;
LoadingHelper.CloseForm();
uiDataGridView1.ClearSelection();
}
private void uiDataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
DataGridViewRow row = uiDataGridView1.Rows;
if (uiDataGridView1.Columns.Name == "clTitle")
{
if (row.Cells["clStatus"].Value is int)
{
var intStatus = (int)row.Cells["clStatus"].Value;
if (intStatus == 1)
{
row.Cells["clOpDown"].Value = FileHelper.loadImageFromLocalPath(@"FileFolder/Icon/downLoad.png");
row.Cells["clOpDelete"].Value = FileHelper.loadImageFromLocalPath(@"FileFolder/Icon/delete1.png");
}
else if (intStatus == 2)
{
row.Cells["clOpDown"].Value = FileHelper.loadImageFromLocalPath(@"FileFolder/Icon/pause.png");
row.Cells["clOpDelete"].Value = FileHelper.loadImageFromLocalPath(@"FileFolder/Icon/delete1.png");
//row.Cells["clOpDelete"].Value = null;
}
else
{
// 创建一个1x1像素的透明图像
Bitmap transparentImage = new Bitmap(1, 1);
transparentImage.SetPixel(0, 0, Color.Transparent);
row.Cells["clOpDown"].Value = transparentImage;
row.Cells["clOpDelete"].Value = transparentImage;
}
}
}
}
private void uiDataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
//uiDataGridView1.ClearSelection();
}
private async void uiDataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (uiDataGridView1.Columns is DataGridViewImageColumn && e.RowIndex >= 0)
{
// 获取当前行的数据行
var currentRow = uiDataGridView1.Rows;
var _Id = (int)currentRow.Cells["clId"].Value;
if (uiDataGridView1.Columns.Name == "clOpDown")
{
//var currentData = _mainList.Find(x => x.Id == _Id);
var currentData = _table.AsEnumerable().FirstOrDefault(x => x.Field<int>("Id") == _Id);
if (currentData != null)
{
if (currentData["Status"].ToString() == "1")
{//1代表 未下载
currentData["Status"] = "2";//修改图标
uiDataGridView1.Refresh();
}
else
{//2代表 正在下载
_taskCondition = false;//终止执行任务
currentData["Status"] = "1";//修改图标
uiDataGridView1.Refresh();
}
//currentData.Status = 1;
//_taskCondition = false;
//uiDataGridView1.Refresh();
}
}
if (uiDataGridView1.Columns.Name == "clOpDelete")
{
// 使用Linq查询匹配的行
var rowsToDelete = _table.AsEnumerable().FirstOrDefault(row => row.Field<int>("Id") == _Id);
_table.Rows.Remove(rowsToDelete);
}
}
}
public void DeleteMainData(int Id)
{
var currentData = _mainList.Find(x => x.Id == Id);
if (currentData != null)
{
_mainList.Remove(currentData);
uiDataGridView1.DataSource = _mainList;
uiDataGridView1.Refresh();
}
}
private void uiDataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
uiDataGridView1.Visible = true;
_lbNotData.Visible = false;
DataGridView dataGridView = (DataGridView)sender;
if (dataGridView.Rows.Count == 0)
{
uiDataGridView1.Dock = DockStyle.None;
uiDataGridView1.Visible = false;
_lbNotData.Visible = true;
}
}
private void uiDataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e)
{
// 取消默认的错误处理行为
e.ThrowException = false;
// 获取出错的单元格
DataGridViewCell errorCell = uiDataGridView1.Rows.Cells;
// 获取出错的数据
object errorValue = uiDataGridView1.Rows.Cells.Value;
// 自定义错误处理逻辑
MessageBox.Show("数据错误：" + e.Exception.Message);
// 可以将出错的单元格的值重置为默认值
errorCell.Value = errorCell.DefaultNewRowValue;
}
}
}
结语
上面完整代码是.cs的代码。大家拷贝本地使用的时候需要在UI界面进行拖拉组件。本例子用的是winform SunnyUI 的框架 。框架文档在这里：文档预览 - Gitee.com
来源:https://www.cnblogs.com/BFMC/p/18020935
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