HttpContentCollectionExtensions.FirstStartOrDefault Method
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Returns the first HttpContent in a sequence that has a ContentDispositionHeaderValue header field parameter equal to start. This parameter is typically used in connection with multipart/related content (see RFC 2387).
Namespace: System.Net.Http
Assembly: System.Net.Http.Formatting (in System.Net.Http.Formatting.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function FirstStartOrDefault ( _
contents As IEnumerable(Of HttpContent), _
start As String _
) As HttpContent
public static HttpContent FirstStartOrDefault(
this IEnumerable<HttpContent> contents,
string start
)
[ExtensionAttribute]
public:
static HttpContent^ FirstStartOrDefault(
IEnumerable<HttpContent^>^ contents,
String^ start
)
static member FirstStartOrDefault :
contents:IEnumerable<HttpContent> *
start:string -> HttpContent
public static function FirstStartOrDefault(
contents : IEnumerable<HttpContent>,
start : String
) : HttpContent
Parameters
- contents
Type: System.Collections.Generic.IEnumerable<HttpContent>
The contents to evaluate.
- start
Type: System.String
The start value to look for. A match is found if a HttpContent has a Content-ID header field with the given value.
Return Value
Type: System.Net.Http.HttpContent
null if source is empty or if no element matches; otherwise the first HttpContent in the sequence with a matching value.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<HttpContent>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.