myaspnetbimage.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.Configuration;

namespace Example_11_9
{
	/// <summary>
	/// Summary description for MyAspNetWord.
	/// </summary>
	public class MyAspNetBImage : System.Web.UI.Page
	{
		private readonly string FILEPATH = ConfigurationSettings.AppSettings["FILEPATH"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///创建水印
				CreateBackImage("用ASP.NET实现简单的文字水印");
			}
		}

		private void CreateBackImage(String str)
		{
			///获取图片
			String filePath = Server.MapPath(FILEPATH);
			System.Drawing.Image img = System.Drawing.Image.FromFile(filePath);
			
			///创建图片
			Graphics graphics = Graphics.FromImage(img);
			graphics.DrawImage(img,0,0,img.Width,img.Height);
			
			///定义字段和画笔
			Font font = new Font("方正大标宋简体",16);
			Brush brush = new SolidBrush(Color.Green);
			

			///打印水印
			graphics.DrawString(str,font,brush,30,100);
			///保存并输出图片
			img.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);
			
			///是否绘画资源
			graphics.Dispose();
			img.Dispose();			
		}

		
		#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.Load += new System.EventHandler(this.Page_Load);
		}
		#endregion
	}
}