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# Interface IBinaryIdMapper

Maps class name and class field names to integer identifiers.

###### Namespace: Apache.Ignite.Core.Binary

###### Assembly: Apache.Ignite.Core.dll

##### Syntax

    public interface IBinaryIdMapper

### Methods

#### GetFieldId(Int32, String)

Gets field ID for the given field of the given class.

##### Declaration

    int GetFieldId(int typeId, string fieldName)

##### Parameters

Type | Name | Description
--- | --- | ---
System.Int32 | typeId | Type ID.
System.String | fieldName | Field name.

##### Returns

Type | Description
--- | ---
System.Int32 | ID of the field or null in case hash code is to be used.

#### GetTypeId(String)

Gets type ID for the given type.

##### Declaration

    int GetTypeId(string typeName)

##### Parameters

Type | Name | Description
--- | --- | ---
System.String | typeName | Full type name.

##### Returns

Type | Description
--- | ---
System.Int32 | ID of the class or 0 in case hash code is to be used.