# KeyValuePairCodec<TKey, TValue> Methods

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.keyvaluepaircodec-2/)

## ReadValue(Reader<TInput>, Field) {#readvalue-1-ref-orleans-serialization-buffers-reader-tinput-orleans-serializatio-a2e41621}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.keyvaluepaircodec-2/methods/readvalue-1-ref-orleans-serialization-buffers-reader-tinput-orleans-serializatio-a2e41621/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Codecs/KeyValuePairCodec.cs#L54-L82)

```csharp
public KeyValuePair<TKey, TValue> KeyValuePairCodec<TKey, ReadValue<TInput>(ref Reader<TInput> reader, Field field)
```

Reads a value.

### Parameters

- `reader` (`Reader<TInput>`): The reader.
- `field` (`Field`): The field.

### Returns

The value.

## WriteField(Writer&lt;TBufferWriter&gt;, uint, Type, KeyValuePair&lt;TKey, TValue&gt;) {#writefield-1-ref-orleans-serialization-buffers-writer-tbufferwriter-uint-system-8cd1c5fd}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.serialization/orleans.serialization.codecs.keyvaluepaircodec-2/methods/writefield-1-ref-orleans-serialization-buffers-writer-tbufferwriter-uint-system-8cd1c5fd/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Serialization/Codecs/KeyValuePairCodec.cs#L42-L49)

```csharp
public void KeyValuePairCodec<TKey, WriteField<TBufferWriter>(ref Writer<TBufferWriter> writer, uint fieldIdDelta, Type expectedType, KeyValuePair<TKey, TValue> value)
```

Writes a field.

### Parameters

- `writer` (`Writer<TBufferWriter>`): The writer.
- `fieldIdDelta` (`uint`): The field identifier delta.
- `expectedType` (`Type`): The expected type.
- `value` (`KeyValuePair<TKey, TValue>`): The value.