按钮事件

Question

if (this.Button1.BackColor == Color.Lime)
            {
                this.Button1.BackColor = Color.Red;
                return;
            }
            if (this.Button1.BackColor == Color.Red)
            {
                this.Button1.BackColor = Color.Yellow;
                return;
            }
            if (this.Button1.BackColor == Color.Yellow)
            {
                this.Button1.BackColor = SystemColors.Control;
                return;
            }
如何可以一直点按钮一直循环~比如点一下红色，再点一下黄色，再点默认色，一直循环下去

Answer 1

Color[] colors = new Color[] { Color.Red, Color.Yellow, ....} // colors that you want to set in the loop.int currentIndex = colors.IndexOf(Button1.BackColor);
currentIndex = (currentIndex + 1 == colors.Length || currentIndex < 0) ? 0 : currentIndex + 1;
Button1.BackColor = colors[currentIndex];I didnot test the above code. but that's question is easy. you are weak. need to study hard.

Answer 2

按照你的写法，把头尾接起来就行了：
if (this.Button1.BackColor == SystemColors.Control) 
    this.Button1.BackColor = Color.Red; 
else if (this.Button1.BackColor == Color.Red) 
    this.Button1.BackColor = Color.Yellow; 
else
    this.Button1.BackColor = SystemColors.Control; 

Answer 3

你想复杂了 我也遇见过一样的问题  不过其实代码很简单
        if (this.Button1.BackColor == Color.Lime) 
       { 
          this.Button1.BackColor = Color.Red; 
                
       }else
       {
         this.Button1.BackColor == Color.Lime
       }

Answer 4

using System;
using System.Collections.Generic;
using System.Drawing;namespace WebApplication1 {
    public partial class _Default : System.Web.UI.Page {
        private Queue<Color> list = new Queue<Color>();
        protected void Page_Load( object sender, EventArgs e ) {
            if( !IsPostBack ) {
                if(list.Count <= 0 ) {
                    list.Enqueue( Color.Yellow );
                    list.Enqueue( Color.Blue );
                    list.Enqueue( Color.Red );
                    ViewState[ "color" ] = list;
                }
            }        }        protected void Button1_Click( object sender, EventArgs e ) {
            Queue<Color> list = LoopColor;
            Button1.BackColor = list.Peek();
            Response.Write( Button1.BackColor.ToString() );
            list.Enqueue( list.Dequeue() );
        }
        public Queue<Color> LoopColor {
            get {
                return ViewState[ "color" ] as Queue<Color>;
            }
            set {
                ViewState[ "color" ] = value;
            }
        }
    }
}

Answer 5

int currentIndex = colors.IndexOf(Button1.BackColor); 
currentIndex = (currentIndex + 1) / colors.Length; 
Button1.BackColor = colors[currentIndex]; 

Answer 6

不好意思写错了
int currentIndex = colors.IndexOf(Button1.BackColor); 
currentIndex = (currentIndex + 1) % colors.Length; 
Button1.BackColor = colors[currentIndex]; 

Answer 7

using System;
using System.Collections.Generic;
using System.Drawing;namespace WebApplication1 {
    public partial class _Default : System.Web.UI.Page {
        private Queue<Color> list = new Queue<Color>();
        protected void Page_Load( object sender, EventArgs e ) {
            if( !IsPostBack ) {
                if(list.Count <= 0 ) {
                    list.Enqueue( Color.Yellow );
                    list.Enqueue( Color.Blue );
                    list.Enqueue( Color.Red );
                    list.Enqueue( Color.Aqua );
                    list.Enqueue( Color.Brown );
                    list.Enqueue( Color.DarkGoldenrod );
                    list.Enqueue( Color.Ivory );
                    //有多少都按照上述格式添加即可,
                    ViewState[ "color" ] = list;
                }
            }        }        protected void Button1_Click( object sender, EventArgs e ) {
            Queue<Color> list = LoopColor;
            Button1.BackColor = list.Peek();
            Response.Write( Button1.BackColor.ToString() );
            list.Enqueue( list.Dequeue() );
        }
        public Queue<Color> LoopColor {
            get {
                return ViewState[ "color" ] as Queue<Color>;
            }
            set {
                ViewState[ "color" ] = value;
            }
        }
    }
}不知道为何不使用JS的方式,这种页面上的逻辑交给客户端操作似乎更合理些!完全没必要上服务器上转个圈

Answer 8

            if (this.button6.BackColor == SystemColors.Control)
            {
                this.button6.BackColor = Color.Red;
                return;
            }
            if (this.button6.BackColor == Color.Red)
            {
                this.button6.BackColor = Color.Yellow;
                return;
            }
            if (this.button6.BackColor == Color.Yellow)
            {
                this.button6.BackColor =SystemColors.Control  ;
                return;
            } 

Answer 9

C#可以的~JS脚本不行~按钮点上去没反应~我也想无刷新就变色~不用服务端代码