代码是以前项目中的 后来移植到core的上面
以下是代码（封装的类）：
public class ValidateCode
{
private string code;
private const int ImageHeigth = 22; //验证码图片的高度
private const double ImageLengthBase = 13; //验证码图片中每个字符的宽度
private const int ImageLineNumber = 10; //噪音线的数量
private const int ImagePointNumber = 50; //噪点的数量
private int length;
public string key; //此处用来保存验证码到Session的Key的
private string url = "/imagecode/";
//设置验证码的长度和内容
public ValidateCode()
{
this.length = 4;
this.code = string.Empty;
}
///<summary>
///产生随机的验证码并加入缓存
///</summary>
/// <param name = "length" > 验证码长度 </ param >
///< returns ></ returns >
public string CreateCode(int length)
{
if (length <= 0)
{
return string.Empty;
}
Random random = new Random();
StringBuilder builder = new StringBuilder();
//产生随机的验证码并拼接起来
for (int i = 0; i < length; i++)
{
builder.Append(random.Next(0, 10));
}
this.code = builder.ToString();
// MCachedHelper.Set<string>(key, code, DateTime.Now.AddMinutes(2));
RedisHelper.StringSet(key, code, 2, RedisFolderEnum.code, RedisEnum.Four);
return this.code;
}
//图形码的内容 可以自定义字母什么的
private static char[] constant =
{
'0','1','2','3','4','5','6','7','8','9'
};
/// <summary>
/// Creates the code.
/// </summary>
public string CreateCode()
{
Random random = new Random();
StringBuilder builder = new StringBuilder();
for (int i = 0; i < 4; i++) //i<6 生成的就是六位的
{
builder.Append(constant[random.Next(0, 10)]);
}
this.code = builder.ToString();
//将图形码的内容存储在redis中 验证是取就可以
RedisHelper.StringSet(key, code, 2, RedisFolderEnum.code, RedisEnum.Four);
return builder.ToString();
}
/// <summary>
/// 根据长度产生验证码 , 并将验证码画成图片
/// </summary>
/// <param name="length">Length.</param>
public void CreateValidateImage(int length)
{
this.CreateCode();
this.CreateValidateImage(this.code);
}
/// <summary>
/// 将验证码存储在七牛云上
/// </summary>
/// <param name="localFile"></param>
/// <param name="saveKey"></param>
public static void UploadFile(string localFile, string saveKey)
{
#region
Mac mac = new Mac("", "");//七牛云ak
// 上传策略，参见
// https://developer.qiniu.com/kodo/manual/put-policy
PutPolicy putPolicy = new PutPolicy();
// 如果需要设置为"覆盖"上传(如果云端已有同名文件则覆盖)，请使用 SCOPE = "BUCKET:KEY"
// putPolicy.Scope = bucket + ":" + saveKey;
putPolicy.Scope = "img-s-code";
// 上传策略有效期(对应于生成的凭证的有效期)
putPolicy.SetExpires(3600);
// 上传到云端多少天后自动删除该文件，如果不设置（即保持默认默认）则不删除
putPolicy.DeleteAfterDays = 1;
string jstr = putPolicy.ToJsonString();
//获取上传凭证
var uploadToken = Auth.CreateUploadToken(mac, jstr);
Qiniu.Common.Config.AutoZone("", "img-s-code", false);//七牛云ak 详情看我的七牛云图片上传
FormUploader upLoader = new FormUploader(false);
HttpResult result = upLoader.UploadFile(localFile, saveKey, uploadToken);
#endregion
if (result.Code != 200)
{
throw new Exception(result.RefText);
}
return;
}
/// <summary>
/// 根据产生的验证码生成图片
/// </summary>
/// <param name="code">Code.</param>
public void CreateValidateImage(string code)
{
if (!string.IsNullOrEmpty(code))
{
//this.Session[key] = code;
//初始化位图Bitmap对象，指定图片对象的大小(宽,高)
Bitmap image = new Bitmap((int)Math.Ceiling((double)(code.Length * ImageLengthBase)), ImageHeigth);
//初始化一块画布
Graphics graphics = Graphics.FromImage(image);
Random random = new Random();
try
{
int num5;
graphics.Clear(Color.White);
//绘制噪音线
for (num5 = 0; num5 < ImageLineNumber; num5++)
{
int num = random.Next(image.Width);
int num3 = random.Next(image.Height);
int num2 = random.Next(image.Width);
int num4 = random.Next(image.Height);
graphics.DrawLine(new Pen(Color.Silver), num, num3, num2, num4);
}
//验证码字体样式
Font font = new Font("Tahoma", 10, FontStyle.Italic | FontStyle.Bold);
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
//绘制验证码到画布
graphics.DrawString(code, font, brush, (float)3, (float)2);
//绘制噪点
for (num5 = 0; num5 < ImagePointNumber; num5++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
graphics.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片
if (!Directory.Exists(url))
{
Directory.CreateDirectory(url);//如果文件夹不存在就创建它
}
image.Save(url + key + ".gif", ImageFormat.Gif);
UploadFile(url + key + ".gif", key + ".gif");
}
finally
{
graphics.Dispose();
image.Dispose();
}
}
}
//Properties
public string Code { get; set; }
public int Length
{
get
{
return this.length;
}
set
{
this.length = value;
}
}
}
下面是使用方法：
validatecode.key = Guid.NewGuid().ToString();
validatecode.CreateValidateImage(4);
validate = new ValidateCodeView
{
name = validatecode.key, 返回的key
imgUrl = $"{_validate.Url}{validatecode.key}.gif" 返回的验证码图片
};
验证方法：
比对输入的值==redis存储的值