C# 選擇本機檔案並上傳

參考自：
http://www.dotblogs.com.tw/puma/archive/2008/11/07/5910.aspx
http://www.codeproject.com/Articles/19398/Example-for-FolderBrowserDialog-in-C
http://www.dotblogs.com.tw/mis2000lab/archive/2011/09/26/fileupload_serverpath_2011.aspx

選擇本機檔案的兩種方式：
1.利用FolderBrowserDialog或OpenFileDialog

<asp:TextBox ID="txtdfolder" runat="server"></asp:TextBox>
<asp:Button ID="ButtonSelectFolder" runat="server" OnClick="btnSelectFolder_Click" text="select folder" />
<asp:TextBox ID="txtdfile" runat="server"></asp:TextBox>
<asp:Button ID="ButtonSelectFile" runat="server" OnClick="btnSelectFile_Click" text="select file" />

public partial class SelectFolder : Form
{
    public SelectFolder()
    {
        InitializeComponent();
    }
    private void btnSelectFolder_Click(object sender, EventArgs e)
    {
        FolderBrowserDialog path = new FolderBrowserDialog();
        // Basically, there are two additional settings available to make the dialog more customized. First, the property
        // ShowNewFolderButton determines whether the user can create a new folder or not.
        this.path.ShowNewFolderButton = false;
        // Second, the property RootFolder defines the top level folder of the dialog, i.e. the folder which will be shown initially.
        this.folderBrowserDialog.RootFolder = System.Environment.SpecialFolder.MyComputer;
        DialogResult result=path.ShowDialog();
        if (result==DialogResult.OK)
        {
            // the code here will be executed if the user presses Open in the dialog.
            this.txtPath.Text = path.SelectedPath;
        }
    }
    
    private void btnSelectFile_Click(object sender, EventArgs e)
    {
        OpenFileDialog file = new OpenFileDialog();
        file.ShowDialog();
        this.txtFile.Text = file.SafeFileName;
    }
}

2. 利用asp:FileUpload

    <asp:FileUpload runat="server" ID="uploadImage" />
    <asp:Button ID="btnOK" runat="server" OnClick="btnOK_Click" />

protected void btnOK_Click(object sender, EventArgs e)
    {

        if (uploadImage.HasFile)
        {
            string fileName = uploadImage.FileName;

            //*********************************************************************
            //*** 方法一 *****
            //-- 註解：先設定好檔案上傳的路徑，這是Web Server電腦上的硬碟「實體」目錄。
            //       C#語法在撰寫磁碟的目錄位置時，請留意以下的寫法：
            //String savePath = "c:\temp\uploads\";
 
            //*** 方法二 *****
            String savePath = Server.MapPath("~/Book_Sample/Ch18_FileUpload/Uploads/");
            //--網站上的 URL路徑。 Server.MapPath() 轉換成Web Server電腦上的硬碟「實體」目錄。
 
            //*** 方法三 *****
            //--註解：網站上的目錄路徑。所以不寫磁碟名稱（不寫 “實體”路徑）。
            //--以下的 URL路徑，請依照實際狀況，進行修改。否則程式會報錯！
            //String saveDir = "\Book_Sample\Ch18_FileUpload\Uploads\";
            //String appPath  = Request.PhysicalApplicationPath;
            ////-- appPath是網站 "根"目錄「轉換成」Server端硬碟路徑。
 
            //String savePath   = appPath + saveDir;
            //*********************************************************************

            string savePath = "c:\Chris\test_upload\";

            String saveResult = savePath + fileName;
            fuImage.SaveAs(saveResult);
        }
        uploadImage.Dispose();
    }