统计

随笔 - 18454
文章 - 64
评论 - 2056
阅读 - 1885万

当有大量数据需要计算、显示在界面或者调用sleep函数时，容易导致界面卡死，可以采用多线程加委托的方法解决

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
 
namespace WindowsFormsApplication1
{
    public partial class FormMain : Form
    {
        DataTable table;
        int currentIndex = 0;
        int max = 10000;
        public FormMain()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Enabled = false;
            Thread thread = new Thread(new ThreadStart(LoadData));
            thread.IsBackground = true;
            thread.Start();
 
            progressBar1.Minimum = 0;
            progressBar1.Maximum = max;
        }
        private void LoadData()
        {
            SetLableText("数据加载中...");
            currentIndex = 0;
            table = new DataTable();
            table.Columns.Add("id");
            table.Columns.Add("name");
            table.Columns.Add("age");
            while (currentIndex < max)
            {
                SetLableText(string.Format("当前行:{0},剩余量:{1},完成比例:{2}%", currentIndex, max - currentIndex,
                         (Convert.ToDecimal(currentIndex) / Convert.ToDecimal(max) * 100).ToString("f0")));
                SetPbValue(currentIndex);
                DataRow dr = table.NewRow();
                dr["id"] = currentIndex;
                string name = "张三";
                dr["name"] = name;
                dr["age"] = currentIndex + 5;
                table.Rows.Add(dr);
                currentIndex++;
            }
            SetDgvDataSource(table);
            SetLableText("数据加载完成！");
 
            this.BeginInvoke(new MethodInvoker(delegate()
            {
                button1.Enabled = true;
            }));
        }
        delegate void labDelegate(string str);
        private void SetLableText(string str)
        {
            if (label1.InvokeRequired)
            {
                Invoke(new labDelegate(SetLableText), new string[] { str });
            }
            else
            {
                label1.Text = str;
            }
        }
        delegate void dgvDelegate(DataTable table);
        private void SetDgvDataSource(DataTable table)
        {
            if (dataGridView1.InvokeRequired)
            {
                Invoke(new dgvDelegate(SetDgvDataSource), new object[] { table });
            }
            else
            {
                dataGridView1.DataSource = table;
            }
        }
        delegate void pbDelegate(int value);
        private void SetPbValue(int value)
        {
            if (progressBar1.InvokeRequired)
            {
                Invoke(new pbDelegate(SetPbValue), new object[] { value });
            }
            else
            {
                progressBar1.Value = value;
            }
        }
    }
}<br>运行效果图：