C#怎么实现loading提示控件

C#怎么实现loading提示控件？这个问题可能是我们日常学习或工作经常见到的。希望通过这个问题能让你收获颇深。下面是小编给大家带来的参考内容，让我们一起来看看吧！

创新互联建站是创新、创意、研发型一体的综合型网站建设公司，自成立以来公司不断探索创新，始终坚持为客户提供满意周到的服务，在本地打下了良好的口碑，在过去的十余年时间我们累计服务了上千家以及全国政企客户，如房屋鉴定等企业单位，完善的项目管理流程，严格把控项目进度与质量监控加上过硬的技术实力获得客户的一致夸奖。

自己画一个转圈圈的控件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ExerciseUIPrj.controls
{
  public partial class LoadControl : Control
  {
    Color beginColor = Color.Blue;
    Color endColor = Color.Red;
    int wid = 10;
    int curindex = 0;
    Timer timer;
    int instervel = 200;
    string loadStr = "loading....";
    public LoadControl()
    {
      InitializeComponent();
      SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint|ControlStyles.OptimizedDoubleBuffer, true);
      this.MinimumSize = new Size(40, 80);
      if (!DesignMode)
      {
        Start();
      }
    }
    public void Start()
    {
      if (timer == null)
      {
        timer = new Timer();
        timer.Interval = instervel;
        timer.Tick += Timer_Tick;
      }
      timer.Enabled = true;
    }
    public void Stop()
    {
      if (timer != null)
      {
        timer.Enabled = false;
      }
    }
    void Timer_Tick(object sender, EventArgs e)
    {
      curindex++;
      curindex = curindex >= wid ? 0 : curindex;
      Refresh();
    }
    //计算各种圈圈相关
    Point getPoint(double d, double r, Point center)
    {
      int x = (int)(r * Math.Cos(d * Math.PI / 180.0));
      int y = (int)(r * Math.Sin(d * Math.PI / 180.0));
      return new Point(center.X + x, center.Y - y);
    }
    GraphicsPath getPath(Point a, Point b)
    {
      Point c, d, e, f;
      int h = 2;
      Vertical(a, b, h, out c, out d);
      Vertical(b, a, h, out e, out f);
      GraphicsPath path = new GraphicsPath();
      path.AddPolygon(new Point[] { c, d, e, f });
      path.CloseAllFigures();
      return path;
    }
    bool Vertical(Point pointa, Point pointb, double R, out Point pointc, out Point pointd)
    {
      pointc = new Point();
      pointd = new Point();
      try
      {
        //（X-xa)^2+(Y-ya)^2=R*R  距离公式
        //(X-xa)*(xb-xa)+(Y-ya)*(yb-ya)=0  垂直
        //解方程得两点即为所求点
        var cx = pointa.X - (pointb.Y - pointa.Y) * R / Distance(pointa, pointb);
        var cy = pointa.Y + (pointb.X - pointa.X) * R / Distance(pointa, pointb);
        var dx = pointa.X + (pointb.Y - pointa.Y) * R / Distance(pointa, pointb);
        var dy = pointa.Y - (pointb.X - pointa.X) * R / Distance(pointa, pointb);
        pointc = new Point((int)cx, (int)cy);
        pointd = new Point((int)dx, (int)dy);
        return true;
      }
      catch
      {
        //如果A,B两点重合会报错，那样就返回false
        return false;
      }
    }
    double Distance(double xa, double ya, double xb, double yb)
    {
      double L;
      L = Math.Sqrt(Math.Pow(xa - xb, 2) + Math.Pow(ya - yb, 2));
      return L;
    }
    double Distance(Point pa, Point pb)
    {
      return Distance(pa.X, pa.Y, pb.X, pb.Y);
    }
    GraphicsPath getPath(double d, double r, Point c)
    {
      var p1 = getPoint(d, r / 2.0, c);
      var p2 = getPoint(d, r, c);
      return getPath(p1, p2);
    }
    //算渐变色
    Color[] getColors()
    {
      int dr = (int)((endColor.R - beginColor.R) / (double)wid);
      int dg = (int)((endColor.G - beginColor.G) / (double)wid);
      int db = (int)((endColor.B - beginColor.B) / (double)wid);
      List colors = new List();
      for (int i = 0; i < wid; i++)
      {
        colors.Add(Color.FromArgb(beginColor.R + dr * i, beginColor.G + dg * i, beginColor.B + db * i));
      }
      return colors.ToArray();
    }
    //画圈圈
    void drawRect(Graphics g)
    {
      int r = (int)(Size.Height / 2.0);
      Point center = new Point(r, r);
      var colors = getColors();
      int findex = curindex;
      for (int i = 0; i < wid; i++)
      {
        double d = (360.0 / wid) * i;
        var p = getPath(d, r, center);
        int cindex = findex + i;
        cindex = cindex >= wid ? cindex - wid : cindex;
        g.FillPath(new SolidBrush(colors[cindex]), p);
      }
    }
    //画字符串
    void drawString(Graphics g)
    {
      if (Size.Height >= Size.Width) return;
      Rectangle rect = new Rectangle(new Point(Size.Height, 0), new Size(Size.Width - Size.Height, Size.Height));
      StringFormat sf = new StringFormat();
      sf.Alignment = StringAlignment.Center;
      sf.LineAlignment = StringAlignment.Center;
      g.DrawString(loadStr, Font, Brushes.Black, rect,sf);
    }
    protected override void OnPaint(PaintEventArgs pe)
    {
      base.OnPaint(pe);
      Graphics g = pe.Graphics;
      g.SmoothingMode = SmoothingMode.HighQuality;
      g.PixelOffsetMode = PixelOffsetMode.HighQuality;
      drawRect(g);
      drawString(g);
    }
    protected override void OnSizeChanged(EventArgs e)
    {
      base.OnSizeChanged(e);
      if (Size.Height > Size.Width)
      {
        Size = new Size(Size.Height, Size.Height);
      }
    }
  }
}

感谢各位的阅读！看完上述内容，你们对C#怎么实现loading提示控件大概了解了吗？希望文章内容对大家有所帮助。如果想了解更多相关文章内容，欢迎关注创新互联行业资讯频道。

网站名称：C#怎么实现loading提示控件
文章出自：http://6mz.cn/article/iepseh.html