MessageEncoder.IsContentTypeSupported(String) Method

Definition

Namespace:

System.ServiceModel.Channels

Assembly:

System.ServiceModel.Primitives.dll

Package:

System.ServiceModel.Primitives v8.0.0

Source:

MessageEncoder.cs

Returns a value that indicates whether a specified message-level content-type value is supported by the message encoder.

public:
 virtual bool IsContentTypeSupported(System::String ^ contentType);

public virtual bool IsContentTypeSupported (string contentType);

abstract member IsContentTypeSupported : string -> bool
override this.IsContentTypeSupported : string -> bool

Public Overridable Function IsContentTypeSupported (contentType As String) As Boolean

Parameters

contentType

String

The message-level content-type being tested.

Returns

Boolean

true if the message-level content-type specified is supported; otherwise false.

Examples

The following code example shows how to override this method to handle different content types with the same media type.

public override bool IsContentTypeSupported(string contentType)
{
    if (base.IsContentTypeSupported(contentType))
    {
        return true;
    }
    if (contentType.Length == this.MediaType.Length)
    {
        return contentType.Equals(this.MediaType, StringComparison.OrdinalIgnoreCase);
    }
    else
    {
        if (contentType.StartsWith(this.MediaType, StringComparison.OrdinalIgnoreCase)
            && (contentType[this.MediaType.Length] == ';'))
        {
            return true;
        }
    }
    return false;
}

public class CustomTextMessageEncoderFactory : MessageEncoderFactory
{
    private MessageEncoder encoder;
    private MessageVersion version;
    private string mediaType;
    private string charSet;

    internal CustomTextMessageEncoderFactory(string mediaType, string charSet,
        MessageVersion version)
    {
        this.version = version;
        this.mediaType = mediaType;
        this.charSet = charSet;
        this.encoder = new CustomTextMessageEncoder(this);
    }

    public override MessageEncoder Encoder
    {
        get
        {
            return this.encoder;
        }
    }

    public override MessageVersion MessageVersion
    {
        get
        {
            return this.version;
        }
    }

    internal string MediaType
    {
        get
        {
            return this.mediaType;
        }
    }

    internal string CharSet
    {
        get
        {
            return this.charSet;
        }
    }
}

Remarks

This method is used to determine whether the message encoder can be used to read a particular style of message, based on its content-type. The information in the ContentType class is used to describe the data that is contained in a message and is used to determine if there is a content-type match.

A grammar that details the syntax of the content-type header is described in RFC 2045 Section 5.1. RFC 2046 provides detailed information on Multipurpose Internet Mail Extensions (MIME) media types and their parameters.