谁能告诉我下面这段程序的执行过程，并有什么办法做个按钮，点击能使界面图片清空？？
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using GDI_画图_四_;
namespace DrawPictureString
{
/// <summary>
/// 显示图片和文字。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
// Windows 窗体设计器支持所必需的
InitializeComponent();
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(360, 296);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "打开";
this.button1.TextAlign = System.Drawing.ContentAlignment.TopCenter;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(8, 18);
this.ClientSize = new System.Drawing.Size(440, 328);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button1});
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
this.MaximizeBox = false;
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "显示图片以及文字";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
public string m_FileName;
public Image m_Image;
public bool m_Init = false;
// 打开图片文件。
private void button1_Click(object sender, System.EventArgs e)
{
openFileDialog1.Filter = "图形文件(*.bmp;*.jpg;*.jpeg)|*.bmp;*.jpg;*.jpeg";
openFileDialog1.FilterIndex = 1;
if(openFileDialog1.ShowDialog() == DialogResult.OK)
{
m_FileName = openFileDialog1.FileName;
m_Image = Image.FromFile(openFileDialog1.FileName);
m_Init = true;
this.Validate();
}
}
// 处理窗体显示事件。
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
if(m_Init)
{
Rectangle rect = new Rectangle(0,0,this.ClientRectangle.Width,
this.ClientRectangle.Height-button1.Height-20);
Graphics g = e.Graphics;
// 显示图片。
g.DrawImage(m_Image, rect);
// 显示图片对应文件名信息。
SolidBrush redBrush = new SolidBrush(Color.Red);
g.DrawString(m_FileName, new Font("宋体", 10), redBrush,
new Point(0,this.ClientRectangle.Height-40), StringFormat.GenericDefault);
}
}
}
}
问题点数：0、回复次数：2Top
1 楼vniper（爱国不爱党！）回复于 2005-06-03 16:23:43 得分 0
m_Image.Dispose();
this.Refresh();
?Top
2 楼kingvia（lala）回复于 2005-06-06 09:35:42 得分 0
可不可以跟我说一下,这段程序整个执行过程,那个paint事件是在不断刷新的吗?Top
