在.net core web项目中生成图片验证码

第1步：添加SkiaSharp包引用

Install-Package SkiaSharp

第2步：编写生成图片验证码的代码

using SkiaSharp; //在类文件头部添加引用

public IActionResult Code()

{

string CodeText = "3bm7"; //实际的项目中不能写死

var charList = CodeText.ToList();

SKBitmap bmp = new SKBitmap(80,30);

using (SKCanvas canvas = new SKCanvas(bmp))

{

//背景色

canvas.DrawColor(SKColors.White);

using (SKPaint sKPaint = new SKPaint())

{

sKPaint.TextSize = 16;//字体大小

sKPaint.IsAntialias = true;//开启抗锯齿

sKPaint.Typeface = SKTypeface.FromFamilyName("微软雅黑");

SKRect size = new SKRect();

//计算文字宽度以及高度

sKPaint.MeasureText(charList[0].ToString(), ref size);

float temp = (bmp.Width / 4 - size.Size.Width) / 2;

float temp1 = bmp.Height - (bmp.Height - size.Size.Height) / 2;

Random random = new Random();

//画文字

for (int i = 0; i < 4; i++)

{

sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));

canvas.DrawText(charList[i].ToString(), temp + 20 * i, temp1, sKPaint);

}

//画干扰线

for (int i = 0; i < 5; i++)

{

sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));

canvas.DrawLine(random.Next(0, 40), random.Next(1, 29), random.Next(41, 80), random.Next(1, 29), sKPaint);

}

}

//页面展示图片

using (SKImage img = SKImage.FromBitmap(bmp))

{

using (SKData p = img.Encode())

{

return File(p.ToArray(), "image/Png");

}

}

}

}

第3步：运行测试