# containsKey method

bool containsKey(

1. String? key

)

Determines whether the Fieldobject contains the specified key.

param key The key to locate in the Field object. return true if the Field object contains an element with the specified key, otherwise false. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    bool containsKey(String? key) {
      Pointer<Char>? pKey = key?.toNativeUtf8().cast<Char>();
      Pointer<Bool> pResult = calloc();
      try {
        var err = biosealSDK.id3BiosealField_ContainsKey(_pHandle.value, pKey ?? nullptr, pResult);
        if (err != BiosealError.success.value) {
          throw BiosealException(err);
        }
        final vResult = pResult.value;
        return vResult;
      } finally {
        if (pKey != null) {
          calloc.free(pKey);
        }
        calloc.free(pResult);
      }
    }