myloadpicture.aspx.cs

ASP C#代码实例 适合初学人士学习使用

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;

namespace Example_11_5
{
	/// <summary>
	/// Summary description for MyLoadPicture.
	/// </summary>
	public class MyLoadPicture : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox FileName;
		protected System.Web.UI.WebControls.Button SureBtn;
		protected System.Web.UI.WebControls.Label sucessMassage;
		protected System.Web.UI.WebControls.Button ShowPicture;
		protected System.Web.UI.WebControls.Image PictureImage;
		protected System.Web.UI.HtmlControls.HtmlInputFile upfile;

		static int pictureID = 0;

		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
		}

		
		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.SureBtn.Click += new System.EventHandler(this.SureBtn_Click);
			this.ShowPicture.Click += new System.EventHandler(this.ShowPicture_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void SureBtn_Click(object sender, System.EventArgs e)
		{
			if(FileName.Text.Trim() != "")
			{
				///定义普通的类
				PictureDB picture = new PictureDB();
				//定义图片的IO流
				Stream pictureStream = upfile.PostedFile.InputStream;
				//保存图片的数据
				byte[] pictureData = new byte[upfile.PostedFile.ContentLength];

				try
				{
					//读取图片的内容
					pictureStream.Read(pictureData,0,upfile.PostedFile.ContentLength);

					pictureID = picture.AddPicture(FileName.Text.Trim(),pictureData,upfile.PostedFile.ContentType);
				}
				catch(Exception ex)
				{
					///现在上载图片错误消息
					///sucessMassage.Visible = true;
					sucessMassage.Text = ex.Message;
				}
			}
			else
			{
				///现在上载图片错误提示消息
				sucessMassage.Visible = true;
				sucessMassage.Text = "文件的名称不能为空！";
			}
		}

		private void ShowPicture_Click(object sender, System.EventArgs e)
		{
			if(pictureID > 0)
			{
				PictureImage.ImageUrl = "~/ShowPicture.aspx?PictureID=" + pictureID.ToString();
			}
			else
			{
				///上载图片为成功，没有显示的图片
				sucessMassage.Visible = true;
				sucessMassage.Text = "上载图片为成功，没有显示的图片！";
			}
		}
	}
}