C#随机验证码四种方法

左手的ㄟ右手 2023-07-24 14:34 3阅读 0赞

## 这次使验证码每个字符的颜色以及他的字体大小都是随机的 ##

## 方法一：for循环直接获取字符 ##

**原理：使用for循环中i来判断获取字符,将字符装进各个label中**

**注意：这种方法只需要每循环一次输出一个字符即可**

**主要代码如下:**

private void Form1_Load(object sender, EventArgs e)
    {
        
    	this.Location = new Point(Screen.PrimaryScreen.WorkingArea.Width/2-this.Width/2,Screen.PrimaryScreen.WorkingArea.Height/2-this.Height/2);
        label1.Text = "";
        label2.Text = "";
        label3.Text = "";
        label4.Text = "";
    }
    Random r = new Random();
    private void button1_Click(object sender, EventArgs e)
    {
        
    	string code = "";//用于接收验证码
        for (int i = 0; i < 4; i++)
        {
        
        	//首先随机类型(数字   大写字母   小写字母
        	int type = r.Next(0,3);
        	if (type==0)//数字
        	{
        
            	code = r.Next(0,10).ToString();
            }
            if (type==1)//大写字母
            {
        
                code = ((char)r.Next(65,91)).ToString();
            }
            if (type==2)//小写字母
            {
        
                code = ((char)r.Next(97,122)).ToString();
            }
            //用i判断
            if (i == 0)
            {
        
                label1.Text = code;
            }
            if (i == 1)
            {
        
                label2.Text = code;
            }
            if (i == 2)
            {
        
                label3.Text = code;
            }
            if (i == 3)
            {
        
                label4.Text = code;
            }
        }
        //设置每个label中的字体颜色随机
        label1.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label2.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label3.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label4.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        //设置每个label中字体随机(大小 字体 斜体 加粗)
        string[] zt = {
         "黑体","宋体","楷体","Impact","Terminal","微软雅黑","仿宋","Tahoma"};
        label1.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Bold);
        label2.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Italic);
        label3.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Strikeout);
        label4.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Underline);
    }

## 方法二：String中Split方法获取字符 ##

**原理：使用String中Split方法通过分割字符串来获取每个字符(将字符装进数组再通过索引依次装进各个label)**

**注意：这种方法需要输出4个字符组成的字符串并且需要在输出的每个字符后面加一个字符（本次加入“-”）**

**主要代码如下：**

private void Form1_Load(object sender, EventArgs e)
    {
        
    	this.Location = new Point(Screen.PrimaryScreen.WorkingArea.Width/2-this.Width/2,Screen.PrimaryScreen.WorkingArea.Height/2-this.Height/2);
        label1.Text = "";
        label2.Text = "";
        label3.Text = "";
        label4.Text = "";
    }
    Random r = new Random();
    private void button1_Click(object sender, EventArgs e)
    {
        
    	string code = "";//用于接收验证码
        for (int i = 0; i < 4; i++)
        {
        
        	//首先随机类型(数字   大写字母   小写字母
        	int type = r.Next(0,3);
        	if (type==0)//数字
        	{
        
            	code += r.Next(0,10).ToString()+"-";
            }
            if (type==1)//大写字母
            {
        
                code += ((char)r.Next(65,91)).ToString()+"-";
            }
            if (type==2)//小写字母
            {
        
                code += ((char)r.Next(97,122)).ToString()+"-";
            }
        }
        string[] str = code.Split('-');//使用字符-来分割字符串
        label1.Text = str[0];
        label2.Text = str[1];
        label3.Text = str[2];
        label4.Text = str[3];
        //设置每个label中的字体颜色随机
        label1.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label2.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label3.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label4.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        //设置每个label中字体随机(大小 字体 斜体 加粗)
        string[] zt = {
         "黑体","宋体","楷体","Impact","Terminal","微软雅黑","仿宋","Tahoma"};
        label1.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Bold);
        label2.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Italic);
        label3.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Strikeout);
        label4.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Underline);
    }

## 方法三：String中Substring方法截取字符 ##

**原理：使用String中Substring方法截取code中的字符,再通过索引依次装进各个label中即可**

**注意：这种方法需要输出4个字符组成的字符串即可**

**主要代码如下：**

private void Form1_Load(object sender, EventArgs e)
    {
        
    	this.Location = new Point(Screen.PrimaryScreen.WorkingArea.Width/2-this.Width/2,Screen.PrimaryScreen.WorkingArea.Height/2-this.Height/2);
        label1.Text = "";
        label2.Text = "";
        label3.Text = "";
        label4.Text = "";
    }
    Random r = new Random();
    private void button1_Click(object sender, EventArgs e)
    {
        
    	string code = "";//用于接收验证码
        for (int i = 0; i < 4; i++)
        {
        
        	//首先随机类型(数字   大写字母   小写字母
        	int type = r.Next(0,3);
        	if (type==0)//数字
        	{
        
            	code += r.Next(0,10).ToString();
            }
            if (type==1)//大写字母
            {
        
                code += ((char)r.Next(65,91)).ToString();
            }
            if (type==2)//小写字母
            {
        
                code += ((char)r.Next(97,122)).ToString();
            }
        }
        //截取code中字符
        string c1 = code.Substring(0, 1);
        string c2 = code.Substring(1, 1);
        string c3 = code.Substring(2, 1);
        string c4 = code.Substring(3, 1);
        label1.Text = c1;
        label2.Text = c2;
        label3.Text = c3;
        label4.Text = c4;
        //设置每个label中的字体颜色随机
        label1.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label2.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label3.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label4.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        //设置每个label中字体随机(大小 字体 斜体 加粗)
        string[] zt = {
         "黑体","宋体","楷体","Impact","Terminal","微软雅黑","仿宋","Tahoma"};
        label1.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Bold);
        label2.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Italic);
        label3.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Strikeout);
        label4.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Underline);
    }

## 方法四：字符串索引 ##

**原理：使用字符串直接索引的方法获取code中的字符依次装进各个label中**

**注意：这种方法需要输出4个字符组成的字符串即可**

**主要代码如下:**

private void Form1_Load(object sender, EventArgs e)
    {
        
    	this.Location = new Point(Screen.PrimaryScreen.WorkingArea.Width/2-this.Width/2,Screen.PrimaryScreen.WorkingArea.Height/2-this.Height/2);
        label1.Text = "";
        label2.Text = "";
        label3.Text = "";
        label4.Text = "";
    }
    Random r = new Random();
    private void button1_Click(object sender, EventArgs e)
    {
        
    	string code = "";//用于接收验证码
        for (int i = 0; i < 4; i++)
        {
        
        	//首先随机类型(数字   大写字母   小写字母
        	int type = r.Next(0,3);
        	if (type==0)//数字
        	{
        
            	code += r.Next(0,10).ToString();
            }
            if (type==1)//大写字母
            {
        
                code += ((char)r.Next(65,91)).ToString();
            }
            if (type==2)//小写字母
            {
        
                code += ((char)r.Next(97,122)).ToString();
            }
        }
        //通过code直接索引得到字符
        label1.Text = code[0].ToString();
        label2.Text = code[1].ToString();
        label3.Text = code[2].ToString();
        label4.Text = code[3].ToString();
        //设置每个label中的字体颜色随机
        label1.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label2.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label3.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        label4.ForeColor = Color.FromArgb(r.Next(0,255),r.Next(0,255),r.Next(0,255));
        //设置每个label中字体随机(大小 字体 斜体 加粗)
        string[] zt = {
         "黑体","宋体","楷体","Impact","Terminal","微软雅黑","仿宋","Tahoma"};
        label1.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Bold);
        label2.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Italic);
        label3.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Strikeout);
        label4.Font = new Font(zt[r.Next(0,8)],r.Next(18,32),FontStyle.Underline);
    }

**运行后效果图:**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdTk5MTAyOQ_size_16_color_FFFFFF_t_70]

## 看完记得点赞奥!!! ##

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdTk5MTAyOQ_size_16_color_FFFFFF_t_70]: /images/20230528/8247d097daca419dbea37a3e7b193e8e.png