HttpWebRequest.ContentType 属性

项目
08/17/2007

获取或设置 Content-typeHTTP 标头的值。

**命名空间:**System.Net
**程序集:**System（在 system.dll 中）

语法

声明
Public Overrides Property ContentType As String
用法
Dim instance As HttpWebRequest
Dim value As String

value = instance.ContentType

instance.ContentType = value

public override string ContentType { get; set; }

public:
virtual property String^ ContentType {
    String^ get () override;
    void set (String^ value) override;
}

/** @property */
public String get_ContentType ()

/** @property */
public void set_ContentType (String value)

public override function get ContentType () : String

public override function set ContentType (value : String)

属性值

Content-typeHTTP 标头的值。默认值为空引用（在 Visual Basic 中为 Nothing）。

备注

ContentType 属性包含请求的媒体类型。当请求发送 Content-typeHTTP 标头时，赋给 ContentType 属性的值替换任何现有内容。

若要清除 Content-type HTTP 标头，请将 ContentType 属性设置为空引用（在 Visual Basic 中为 Nothing）。

提示

此属性的值存储在 WebHeaderCollection 中。如果设置了 WebHeaderCollection，则该属性值将丢失。

示例

下面的代码示例设置 ContentType 属性。

' Set the 'Method' property of the 'Webrequest' to 'POST'.
myHttpWebRequest.Method = "POST"

Console.WriteLine(ControlChars.Cr + "Please enter the data to be posted to the (https://www.contoso.com/codesnippets/next.asp) Uri :")
' Create a new string object to POST data to the Url.
Dim inputData As String = Console.ReadLine()
Dim postData As String = "firstone" + ChrW(61) + inputData
Dim encoding As New ASCIIEncoding()
Dim byte1 As Byte() = encoding.GetBytes(postData)
' Set the content type of the data being posted.
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded"
' Set the content length of the string being posted.
myHttpWebRequest.ContentLength = byte1.Length
Dim newStream As Stream = myHttpWebRequest.GetRequestStream()
newStream.Write(byte1, 0, byte1.Length)
Console.WriteLine("The value of 'ContentLength' property after sending the data is {0}", myHttpWebRequest.ContentLength)
newStream.Close()

// Set the 'Method' property of the 'Webrequest' to 'POST'.
myHttpWebRequest.Method = "POST";
Console.WriteLine ("\nPlease enter the data to be posted to the (https://www.contoso.com/codesnippets/next.asp) Uri :");

// Create a new string object to POST data to the Url.
string inputData = Console.ReadLine ();


string postData = "firstone=" + inputData;
ASCIIEncoding encoding = new ASCIIEncoding ();
byte[] byte1 = encoding.GetBytes (postData);

// Set the content type of the data being posted.
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";

// Set the content length of the string being posted.
myHttpWebRequest.ContentLength = byte1.Length;

Stream newStream = myHttpWebRequest.GetRequestStream ();

newStream.Write (byte1, 0, byte1.Length);
Console.WriteLine ("The value of 'ContentLength' property after sending the data is {0}", myHttpWebRequest.ContentLength);

// Close the Stream object.
newStream.Close ();

// Set the 'Method' property of the 'Webrequest' to 'POST'.
myHttpWebRequest->Method = "POST";
Console::WriteLine( "\nPlease enter the data to be posted to the (https://www.contoso.com/codesnippets/next.asp) Uri :" );

// Create a new String* Object* to POST data to the Url.
String^ inputData = Console::ReadLine();

String^ postData = String::Concat( "firstone= ", inputData );
ASCIIEncoding^ encoding = gcnew ASCIIEncoding;
array<Byte>^ byte1 = encoding->GetBytes( postData );

// Set the content type of the data being posted.
myHttpWebRequest->ContentType = "application/x-www-form-urlencoded";

// Set the content length of the String* being posted.
myHttpWebRequest->ContentLength = byte1->Length;

Stream^ newStream = myHttpWebRequest->GetRequestStream();

newStream->Write( byte1, 0, byte1->Length );
Console::WriteLine( "The value of 'ContentLength' property after sending the data is {0}", myHttpWebRequest->ContentLength );

// Close the Stream Object*.
newStream->Close();

// Set the 'Method' property of the 'Webrequest' to 'POST'.
myHttpWebRequest.set_Method("POST");
Console.WriteLine("\nPlease enter the data to be posted to the "
    + "(https://www.contoso.com/codesnippets/next.asp) Uri :");

// Create a new string object to POST data to the Url.
String inputData = Console.ReadLine();

String postData = "firstone=" + inputData;
ASCIIEncoding encoding = new ASCIIEncoding();
ubyte byte1[] = encoding.GetBytes(postData);

// Set the content type of the data being posted.
myHttpWebRequest.set_ContentType("application/x-www-form-"
    +"urlencoded");
// Set the content length of the string being posted.
myHttpWebRequest.set_ContentLength(postData.length());

Stream newStream = myHttpWebRequest.GetRequestStream();

newStream.Write(byte1, 0, byte1.length);
Console.WriteLine("The value of 'ContentLength' property after"
    + " sending the data is {0}", 
    System.Convert.ToString(myHttpWebRequest.get_ContentLength()));
// Close the Stream object.
newStream.Close();

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

HttpWebRequest.ContentType 属性

语法

属性值

备注

示例

平台

版本信息

.NET Framework

.NET Compact Framework

请参见

参考

其他资源