Base64 错误的解决方案（Base-64 字符数组或字符串的长度无效，）输入不是有效的 Base-64 字符串，因为它包含非 Base-64 字符、超过两个填充字符或填充字符之间，包含非法字符，）

使用系统；
使用 Microsoft.VisualStudio.TestTools.UnitTesting；
使用 MnCny 接口；
使用 System.Web；
使用 System.Collections.Generic;
使用 System.Collections.Specialized;
使用 System.Linq;
使用系统.IO； 命名空间 UnitTestProject1
{
[测试班]
公共课UnitTest1
{
[测试方法]
公共无效测试方法1（）
{ 试试
{
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 //过滤特殊字符即可
string dummyData = imgData.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+");
if (dummyData.Length % 4 > 0)
{
dummyData = dummyData.PadRight(dummyData.Length + 4 - dummyData.Length % 4, '=');
}
byte[] byteArray = Convert.FromBase64String(dummyData); }
catch (System.Exception exp)
{
// 创建流或读取流时出错。
System.Console.WriteLine("{0}", exp.Message);
返回；
} }
}
}

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