Conversion error while converting Lazy

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WPF

MEF

Hi,
I want to convert Lazy<object, object> to Lazy<IOperationData, IOperation> where IOperationData and IOperation are interfaces.

foreach (Lazy<object, object> i in operations)
            {
                if ((i.Metadata as IOperationData).Symbol.Equals(operation)) 
                       return (i.Value as IOperation).Operate(left, right).ToString();
            }