HtmlInputFile.Value 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得用戶端電腦檔案的完整路徑。
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, setPublic Overrides Property Value As String屬性值
客戶檔案的完整路徑。
- 屬性
例外狀況
曾嘗試為此財產賦予價值。
範例
以下程式碼範例示範如何利用該 Value 屬性在用戶端電腦上顯示檔案的完整路徑。 這個例子要正常運作，你需要在電腦的 C 碟上建立一個被命名 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
該 Value 屬性會取得用戶端電腦上檔案的完整路徑（例如 “C:\MyFiles\Test.txt”）。 當你需要知道檔案在提交檔案的電腦中存放在哪裡時，這非常有用。 此特性也常用於判定原始檔案名稱。 要取得原始檔名，請解析此屬性的值。
備註
該 Value 屬性為唯讀。 如果你嘗試為這個屬性指派一個值，就會拋出 a System.NotSupportedException 。
