C# 常用方法——base64字符串转内存流

其他常用方法详见：https://www.cnblogs.com/zhuanjiao/p/12060937.html

         /// <summary>
		/// base64编码的文本转为内存流
		/// </summary>
		/// <param name="base64Str"></param>
		/// <param name="savePath"></param>
		public MemoryStream Base64StringToImage(string base64Str)
		{
			try
			{
				//将base64头部信息替换
				base64Str = base64Str.Replace("data:image/png;base64,", "").Replace("data:image/jgp;base64,", "")
					.Replace("data:image/jpg;base64,", "").Replace("data:image/jpeg;base64,", "");
				byte[] arr = Convert.FromBase64String(base64Str);
				return new MenoryStream(arr);
			}
			catch (Exception ex)
			{
				throw ex;
			}
		}