About Convert.ToBase64String()

最新推荐文章于 2023-05-04 16:30:46 发布
最新推荐文章于 2023-05-04 16:30:46 发布 · 131 阅读 · 0

本文介绍了在使用Convert.ToBase64String方法时可能遇到的FormatException异常情况及其原因。当输入字符串长度不是4的倍数时，该方法将无法正确解析Base64编码。
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在使用Convert.ToBase64String()对字符串进行Base64编码时，注意的几点：
例：string s = "Hello";
byte[] bytes = Convert.FromBase64String(s);
以上代码在运行时会抛出FormatException异常.提示为：Base-64字符数组的无效长度

原因：当Convert.FromBase64String方法的参数s的长度小于 4 或不是 4 的偶数倍时，将会抛出FormatException。

例:
Convert.FromBase64String("Hell"); // Normal.
Convert.FromBase64String("Hell "); // Normal.（忽略空格）
Convert.FromBase64String("Hello!");// throw FormatException.
Convert.FromBase64String("Hello Net"); // Normal.（忽略空格）

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