docs/015_验证码生成.md

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# 验证码生成

> 所属包: DotNetCommon.Core



在登录页中，经常使用验证码生成，这里提供了简单的封装，能够生成指定位数的验证码图片。

使用方法：

```csharp
var (code,imageBase64) = VerifyCodeHelper.New(4);
//输出示例：
//code:693C
//imageBase64:
/*
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
*/
```

将上面的图片直接放到html中显示：

```html
<img src="data:image/jpeg;base64,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" alt="">
```