本文实例讲述了C#基于Extension Method(扩展方法)获得文件大小的方法。分享给大家供大家参考。具体分析如下：
文件信息类的一个Extension Method，返回文件大小的格式化的版本。
比如：1 GB or 100 B and it at max it will have two decimals.
添加下面代码到同样的命名空间的公共静态类，创建新的FileInfo，调用GetFileSize。
/// <summary>
/// Gets a files formatted size.
/// </summary>
/// <param name="file">The file to return size of.</param>
/// <returns></returns>
public static string GetFileSize(this FileInfo file)
{
try
{
//determine all file sizes
double sizeinbytes = file.Length;
double sizeinkbytes = Math.Round((sizeinbytes / 1024));
double sizeinmbytes = Math.Round((sizeinkbytes / 1024));
double sizeingbytes = Math.Round((sizeinmbytes / 1024));
if (sizeingbytes > 1)
return string.Format("{0} GB", sizeingbytes);
//returns size in gigabytes
else if (sizeinmbytes > 1)
return string.Format("{0} MB", sizeinmbytes);
//returns size in megabytes if less than one gigabyte
else if (sizeinkbytes > 1)
return string.Format("{0} KB", sizeinkbytes);
//returns size in kilabytes if less than one megabyte
else
return string.Format("{0} B", sizeinbytes);
//returns size in bytes if less than one kilabyte
}
catch { return "Error Getting Size"; }
//catches any possible error and just returns error getting size
}
希望本文所述对大家的C#程序设计有所帮助。
