f8/sdk/dart/package-fidl_fidl/AsyncProxyController/bind.md

# bind method








void bind
([InterfaceHandle](../../package-fidl_fidl/InterfaceHandle-class.md)<T> interfaceHandle)





<p>Binds the proxy to the given interface handle.</p>
<p>Calls to the proxy will be encoded as messages and sent over the channel
underlying the given interface handle.</p>
<p>This object must not already be bound.</p>
<p>The <code>interfaceHandle</code> parameter must not be null. The <code>channel</code> property
of the given <code>interfaceHandle</code> must not be null.</p>



## Implementation

```dart
void bind(InterfaceHandle<T> interfaceHandle) {
  if (!isUnbound) {
    throw FidlStateException(
        "AsyncProxyController<${$interfaceName}> isn't unbound");
  }

  final channel = interfaceHandle.passChannel();
  if (channel == null) {
    throw FidlError(
        "AsyncProxyController<${$interfaceName}> can't bind to null InterfaceHandle channel");
  }

  _reader.bind(channel);
  state = InterfaceState.bound;
}
```