【C#动态加载数据】“防界面卡死”

废话不多说，直接开始

添加引用

using System.ComponentModel

完整代码

using System;  
using System.ComponentModel;  
using System.Data;  
using System.Windows.Forms;  
using System.Data.SqlClient; // 引入SqlClient命名空间以使用ADO.NET  
  
public partial class YourForm : Form  
{  
    private BackgroundWorker backgroundWorker;  
  
    public YourForm()  
    {  
        InitializeComponent();  
        backgroundWorker = new BackgroundWorker();  
        backgroundWorker.WorkerReportsProgress = true; // 如果你不需要报告进度，可以设置为false  
        backgroundWorker.DoWork += BackgroundWorker_DoWork;  //task开始执行方法
        backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(DW_Change_Progress);//进度汇报事件
        backgroundWorker.RunWorkerCompleted += BackgroundWorker_RunWorkerCompleted;  //task结束事件
    }  
  
    private void StartButton_Click(object sender, EventArgs e)  
    {  
        List<string> param= new List<string>(){"back_work_intput_parameter"};
        if (!backgroundWorker.IsBusy)  
        {  
            // 在开始工作之前，可以禁用UI元素以防止用户进行其他操作  
            StartButton.Enabled = false;  
            backgroundWorker.RunWorkerAsync(param); // 启动后台工作  
        }  
    }  
  
    private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)  
    {  
        List<string> param = (List<string>)e.Argument;//获取入参
        if (param.Count < 1) return;
        
        // 这个方法将在后台线程上执行  
        try  
        {  
            using (SqlConnection connection = new SqlConnection(YourConnectionString)) // 替换为你的连接字符串  
            {  
                connection.Open();  
                using (SqlCommand command = new SqlCommand("SELECT * FROM YourTable", connection)) // 替换为你的SQL查询和表名  
                {  
                    using (SqlDataReader reader = command.ExecuteReader())  
                    {  
                        DataTable dataTable = new DataTable();  
                        dataTable.Load(reader);  
                        // 将DataTable作为结果传递给RunWorkerCompleted事件处理程序  
                        e.Result = dataTable;  
                    }  
                }  
            }  
        }  
        catch (Exception ex)  
        {  
            // 将异常传递给RunWorkerCompleted事件处理程序  
            e.Result = ex;  
        }  
    }  
    public void DW_Change_Progress(object sender, ProgressChangedEventArgs e)
    {
        Progress.Value = (float)e.ProgressPercentage /   (float)db_name_list.Count;   
    }
    private void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)  
    {  
        // 这个方法将在UI线程上执行，当DoWork完成时  
        if (e.Error != null)  
        {  
            // 处理异常  
            MessageBox.Show(e.Error.Message);  
        }  
        else  
        {  
            // 获取并处理数据  
            DataTable dataTable = e.Result as DataTable;  
            if (dataTable != null)  
            {  
                // 更新UI，例如将数据绑定到DataGridView等控件上  
                yourDataGridView.DataSource = dataTable;  
            }  
        }  
        finally  
        {  
            // 重新启用UI元素  
            StartButton.Enabled = true;  
        }  
    }  
}

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