Class Blob

A class representing an arbitrary piece of binary data

Inheritance
System.Object
Blob
Implements
Inherited Members
System.Object.Equals(System.Object, System.Object)
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
Namespace: Couchbase.Lite
Assembly: Couchbase.Lite.dll
Syntax
public sealed class Blob : IJSON

Constructors

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Blob(String, Byte[])

Creates a blob given a type and in memory content

Declaration
public Blob(string contentType, byte[] content)
Parameters
Type Name Description
System.String contentType

The binary type of the blob
System.Byte[] content

The content of the blob
Exceptions
Type Condition
System.ArgumentNullException

Thrown if content is null
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Blob(String, Stream)

Creates a blob given a type and streaming content

Declaration
public Blob(string contentType, Stream stream)
Parameters
Type Name Description
System.String contentType

The binary type of the blob
System.IO.Stream stream

The stream containing the blob content
Exceptions
Type Condition
System.ArgumentNullException

Thrown if stream is null
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Blob(String, Uri)

Creates an blob given a type and a URL to a file

Declaration
public Blob(string contentType, Uri fileUrl)
Parameters
Type Name Description
System.String contentType

The binary type of the blob
System.Uri fileUrl

The url to the file to read
Exceptions
Type Condition
System.ArgumentNullException

Thrown if fileUrl is null
System.ArgumentException

Thrown if fileUrl is not a file based URL

Properties

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Content

Gets the contents of the blob as an in-memory array

Declaration
public byte[] Content { get; }
Property Value
Type Description
System.Byte[]
Exceptions
Type Condition
System.InvalidOperationException

Thrown if this blob has no associated data (unusual)
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ContentStream

Gets the contents of the blob as a System.IO.Stream

Declaration
public Stream ContentStream { get; }
Property Value
Type Description
System.IO.Stream
Remarks

The caller is responsible for disposing the Stream when finished with it.

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ContentType

Gets the content type of the blob

Declaration
public string ContentType { get; }
Property Value
Type Description
System.String
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Digest

Gets the digest of the blob, once it is saved

Declaration
public string Digest { get; }
Property Value
Type Description
System.String
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Length

Gets the length of the data that the blob contains

Declaration
public int Length { get; }
Property Value
Type Description
System.Int32
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Properties

Gets the metadata of the blob instance

Declaration
public IReadOnlyDictionary<string, object> Properties { get; }
Property Value
Type Description
System.Collections.Generic.IReadOnlyDictionary<System.String, System.Object>
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Type

Gets the metadata type of this object (hardcoded to LiteCore.Constants.ObjectTypeBlob)

Declaration
public string Type { get; }
Property Value
Type Description
System.String

Methods

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Equals(Object)

Determines whether the specified object is equal to the current object.

Declaration
public override bool Equals(object obj)
Parameters
Type Name Description
System.Object obj

The object to compare with the current object.

Returns
Type Description
System.Boolean

true if the specified object is equal to the current object; otherwise, false.
Overrides
System.Object.Equals(System.Object)
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GetHashCode()

Declaration
public override int GetHashCode()
Returns
Type Description
System.Int32
Overrides
System.Object.GetHashCode()
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IsBlob(IDictionary<String, Object>)

Return whether the given dictionary represents Blob or not

Declaration
public static bool IsBlob(IDictionary<string, object> blobDict)
Parameters
Type Name Description
System.Collections.Generic.IDictionary<System.String, System.Object> blobDict

JSON Dictionary represents in the Blob :

Key | Value | Mandatory | Description

@type | constant string “blob” | Yes | Indicate Blob data type. content_type | String | No | Content type ex. text/plain. length | Number | No | Binary length of the Blob in bytes. digest | String | Yes | The cryptographic digest of the Blob’s content.
Returns
Type Description
System.Boolean

Return true if the given dictionary represents Blob, otherwise return false
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ToJSON()

Converts this object to JSON format string.

Declaration
public string ToJSON()
Returns
Type Description
System.String

The contents of this object in JSON format string
Exceptions
Type Condition
System.NotSupportedException

Thrown if ToJSON is called from MutableDocument,
MutableDictionaryObject, or MutableArrayObject
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ToString()

Returns a string that represents the current object.

Declaration
public override string ToString()
Returns
Type Description
System.String

A string that represents the current object.
Overrides
System.Object.ToString()

Implements