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HtmlInputFile.Value 屬性

定義

取得用戶端電腦上檔案的完整路徑。

public:
 virtual property System::String ^ Value { System::String ^ get(); void set(System::String ^ value); };
[System.ComponentModel.Browsable(false)]
public override string Value { get; set; }
[<System.ComponentModel.Browsable(false)>]
member this.Value : string with get, set
Public Overrides Property Value As String

屬性值

String

用戶端檔案的完整路徑。

屬性

例外狀況

嘗試指派值給這個屬性。

範例

下列程式碼範例示範如何使用 Value 屬性,在用戶端電腦上顯示檔案的完整路徑。 若要讓此範例正常運作,您必須在電腦的磁片磁碟機 C 上建立名為 Temp 的目錄。

<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  void Button1_Click(object Source, EventArgs e)
  {

    // Make sure a file was submitted.
    if (Text1.Value == "")
    {
      Span1.InnerHtml = "Error: You must enter a file name.";
      return;
    }

    // Save the file.
    if (File1.PostedFile.ContentLength > 0)
    {
      try
      {

        File1.PostedFile.SaveAs("c:\\temp\\" + Text1.Value);
        Span1.InnerHtml = "<b>" + File1.Value + "</b>" +
                          " uploaded successfully to <b>c:\\temp\\" +
                          Text1.Value + "</b> on the Web server.";

      }
      catch (Exception exc)
      {

        Span1.InnerHtml = "Error saving file <b>c:\\temp\\" +
                          Text1.Value + "</b><br />" + exc.ToString() + ".";

      }
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>HtmlInputFile Example</title>
  </head>

  <body>

    <h3>HtmlInputFile Example</h3>

    <form id="form1" enctype="multipart/form-data" 
          runat="server">
 
       Select File to Upload: 
       <input id="File1" 
              type="file" 
              runat="server" />
 
       <p>
       Save as file name (no path): 
       <input id="Text1" 
              type="text" 
              runat="server" />
 
       </p>
       <p>
       <span id="Span1" 
             style="font: 8pt verdana;" 
             runat="server" />
 
       </p>
       <p>
       <input type="button" 
              id="Button1" 
              value="Upload" 
              onserverclick="Button1_Click" 
              runat="server" />
 
       </p>
    </form>

  </body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Public Sub Button1_Click(ByVal Source As Object, ByVal e As EventArgs)
 
    ' Make sure a file was submitted.
    If Text1.Value = "" Then
 
      Span1.InnerHtml = "Error: You must enter a file name."
      Return

    End If
 
    ' Save the file.
    If File1.PostedFile.ContentLength > 0 Then
         
      Try

        File1.PostedFile.SaveAs("c:\temp\" & Text1.Value)
        Span1.InnerHtml = "<b>" & File1.Value & "</b>" & _
                          " uploaded successfully to <b>c:\temp\" & _
                          Text1.Value & "</b> on the Web server."
      
      Catch exc As Exception
      
        Span1.InnerHtml = "Error saving file <b>c:\temp\" & _
                          Text1.Value & "</b><br />" & exc.ToString() & "."

      End Try

    End If

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>HtmlInputFile Example</title>
  </head>

  <body>

  <h3>HtmlInputFile Example</h3>

    <form id="form1" enctype="multipart/form-data" 
          runat="server">
 
       Select File to Upload: 
       <input id="File1" 
              type="file" 
              runat="server" />
 
       <p>
       Save as file name (no path): 
       <input id="Text1" 
              type="text" 
              runat="server" />
 
       </p>
       <p>
       <span id="Span1" 
             style="font: 8pt verdana;" 
             runat="server" />
 
       </p>
       <p>
       <input type="button" 
              id="Button1" 
              value="Upload" 
              onserverclick="Button1_Click" 
              runat="server" />
 
       </p>
    </form>

  </body>
</html>

備註

屬性 Value 會擷取用戶端電腦上檔案的完整路徑 (,例如 「C:\MyFiles\Test.txt」) 。 當您需要知道檔案儲存在提交檔案的電腦上時,這非常有用。 這個屬性也常用來判斷原始檔案名稱。 若要取得原始檔案名稱,請剖析這個屬性的值。

注意

Value 屬性是唯讀的。 如果您嘗試將值指派給這個屬性, System.NotSupportedException 則會擲回 。

適用於

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