fileuploadextension.aspx.cs

《圣殿祭司的ASP.NET 2.0开发详解——使用C#》光盘内容.包含了书籍所含的源代码.非常经典的一本asp.net2.0的书籍

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Configuration;
using System.IO;

public partial class FileUploadExtension : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
		if (!IsPostBack)
		{
			//开启网站的Web.config配置文件
			Configuration config = WebConfigurationManager.OpenWebConfiguration(this.Request.ApplicationPath);
			//取得system.web/httpRuntime配置区块
			HttpRuntimeSection myHttpRuntimeSection = (HttpRuntimeSection)config.GetSection("system.web/httpRuntime");
			//取得MaxRequestLength设定值大小
			txtFileSize.Text = "(文件上传总和最大限制为" + string.Format("{0:N0}", Convert.ToInt32(myHttpRuntimeSection.MaxRequestLength)) + "KB大小)";
			FileUpload1.Focus();
		}
    }

	//文件上传
	protected void btnUpload_Click(object sender, EventArgs e)
	{
		txtMsg.Text = "";
		try
		{
			Upload(FileUpload1);
			Upload(FileUpload2);
			Upload(FileUpload3);
			Upload(FileUpload4);
			Upload(FileUpload5);
			Upload(FileUpload6);
			Upload(FileUpload7);
			Upload(FileUpload8);
			Upload(FileUpload9);
			Upload(FileUpload10);

			txtMsg.Text = "完成文件上传如下：<BR>" + ViewState["Uploads"].ToString();
			ViewState["Uploads"] = null;
		}
		catch (Exception ex)
		{
			txtMsg.Text = ex.Message;
		}
	}

	//上传文件方法
	private void Upload(FileUpload myFileUpload)
	{
		//是否允许上载
		bool fileAllow = false;
		//设定允许上载的扩展文件名类型
		string[] allowExtensions ={ ".doc",".xls",".ppt",".jpg",".gif"};

		//取得网站根目录路径
		string path = HttpContext.Current.Request.MapPath("~/");
		//检查是否有文件案
		if (myFileUpload.HasFile)
		{
			//取得上传文件之扩展文件名，并转换成小写字母
			string fileExtension = System.IO.Path.GetExtension(myFileUpload.FileName).ToLower();
			//检查扩展文件名是否符合限定类型
			for (int i = 0; i < allowExtensions.Length; i++)
			{
				if (fileExtension == allowExtensions[i])
				{
					fileAllow = true;
				}
			}

			if (fileAllow)
			{
				try
				{
					//存储文件到文件夹
					myFileUpload.SaveAs(path + myFileUpload.FileName);
					ViewState["Uploads"] += myFileUpload.PostedFile.FileName + "<br>";
				}
				catch (Exception ex)
				{
					txtMsg.Text += ex.Message;
				}
			}
			else
			{
				ViewState["Uploads"] += "不允许上载：" + myFileUpload.PostedFile.FileName + "<br>";
			}
		}
		else
		{
			//检查至少必须指定一个上传文件
			if (hasFile())
			{
				txtMsg.Text = "必须指定文件！";
			}
		}
	}

	//检查是否有文件，若十个FileUpload控制项无指定文件则返回false
	private bool hasFile()
	{
		//status为检查FileUpload是否含有文件，默认为false，若有文件则为true
		bool status = false;

		status = FileUpload1.HasFile && FileUpload2.HasFile && FileUpload3.HasFile && FileUpload4.HasFile && FileUpload5.HasFile && FileUpload6.HasFile && FileUpload7.HasFile && FileUpload8.HasFile && FileUpload9.HasFile && FileUpload10.HasFile;

		/*以上写法等同下面写法
		status = FileUpload1.HasFile;
		status = FileUpload2.HasFile;
		status = FileUpload3.HasFile;
		status = FileUpload4.HasFile;
		status = FileUpload5.HasFile;
		status = FileUpload6.HasFile;
		status = FileUpload7.HasFile;
		status = FileUpload8.HasFile;
		status = FileUpload9.HasFile;
		status = FileUpload10.HasFile;
		 * */
		return status;
	}
}