filename.cs

很不错的公文流转系统

using System; 

namespace OI.Modules
{
	/// <summary>
	///提供的文件名进行处理的类
	/// </summary>
	public class FileName
	{
		public FileName()
		{
			//
			// TODO: 在此处添加构造函数逻辑
			//
		}
		/// <summary>
		/// 获取文件扩展名
		/// </summary>
		/// <param name="FullFileName"></param>
		/// <returns></returns>		
		public static string GetExtFileName(string FullFileName)
		{
			int i;
			int m;
			if(FullFileName!=null)
			{
				m=FullFileName.LastIndexOf("\\");
				if(m>0)
					FullFileName=FullFileName.Substring(m+1);
				m=FullFileName.LastIndexOf("/");
				if(m>0)
					FullFileName=FullFileName.Substring(m+1);
				i=FullFileName.LastIndexOf(".");
				if(i>0)
				{
					return FullFileName.Substring(i+1);
				}
				else
				{
					return "";
				}
			}
			return "";
		}
		/// <summary>
		/// 判断该文件是否为图片
		/// </summary>
		/// <param name="FullFileName"></param>
		/// <returns></returns>
		public static bool IsImage(string FullFileName)
		{
			string ext=GetExtFileName(FullFileName).ToLower();
			if(ext=="jpeg"||ext=="jpg"||ext=="gif")
				return true;
			return false;
		}
		/// <summary>
		/// 根据文件名随机产生一个不重名的同扩展名的文件名
		/// </summary>
		/// <param name="FullFileName"></param>
		/// <returns></returns>
		public static string NewFileName(string FullFileName)
		{
			string ext=GetExtFileName(FullFileName);
			if(ext!=null&&ext!="")
				return System.Guid.NewGuid().ToString()+"."+ext;
			return System.Guid.NewGuid().ToString();
			
		}
								

	}
}