C# 弹出文件对话框

Question

怎么点击一下按钮,然后弹出一个文件选择框? 怎么弄,设计,写代码都可以,只能实现就行了!万分感谢!

Answer 1

        private void btnOpenFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.DefaultExt = "jpg";
            ofd.Filter = "Jpg文件(*.jpg)|*.jpg|Bmp文件(*.bmp)|*.bmp|Gif文件(*.gif)|*.gif";
            ofd.Title = "选择背景图片";
            ofd.Multiselect = false;
            ofd.ShowDialog();            if (ofd.FileName.Trim() != string.Empty)
            {
                try
                {
                    pnlBgImage.BackgroundImage = Image.FromFile(ofd.FileName.Trim());
                    tbBackgroundFile.Text = ofd.FileName.Trim();
                }
                catch
                {
                    MessageBox.Show("装入图像文件失败，请检查文件格式是否正确或文件是否已经损坏。", "程序出错", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

Answer 2

//这是打开文件的对话框：
private void button1_Click(object sender, EventArgs e)
        {            string Fname;
            openFileDialog1.FileName = null;
            openFileDialog1.Filter = "文本文件(*.txt)|*.txt";
            openFileDialog1.FilterIndex = 1;
            openFileDialog1.Title = "打开文件";
            openFileDialog1.InitialDirectory = Application.StartupPath;
            openFileDialog1.RestoreDirectory = true;
            openFileDialog1.ShowDialog();
            Fname = openFileDialog1.FileName;
            if (Fname != "")
                if (openFileDialog1.FilterIndex == 1)
                {
                    rtbdisplay.LoadFile(Fname, RichTextBoxStreamType.PlainText);
                    if (rtbdisplay.Text.Length == 0)
                        MessageBox.Show("嵌入的文本为空，请重新嵌入", "提示对话框");
                }
          }
//若只是打开一个提示对话框，则用MessageBox.Show();函数就可以，里面有很多种重载函数，给你举一个例子：MessageBox.Show("嵌入的文本为空，请重新嵌入", "提示对话框");

Answer 3

给按钮加上OnClientClick="return confirm('确定记录cookie吗？')" 然后在OnClick事件里写cookie值 
------------------ 当点按钮时,自动弹出"确定取消"对话框,当点确定时就执行Button1_Click事件.可以把改写cookie值<asp:Button ID="Button1" runat="server" Text="保存" OnClick="Button1_Click" OnClientClick="return confirm('确定记录cookie吗？')" />放在Button1_Click事件里;我js不是很熟,用js也是可以写cookie的. 
------ 可以在客户端事件里使用"__doPostBack('Button1','')"调用button1的服务器端事件 <asp:Button ID="Button2" Text="保存" OnClick="__doPostBack('Button1','')" /> 
用js触发Button2的单机事件就执行了服务器端控件Button1的单击事件.

Answer 4

private void button3_Click(object sender, EventArgs e)
        {
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                string result = this.OutToExcel(saveFileDialog1.FileName, this.dataGridView1); //this.dataGridView1:DataGridView控件
                MessageBox.Show(result.ToString());
            }
            else
            {
                MessageBox.Show("NO Saved!");                
            }
        }