System.Data.Common.CommandTrees.ExpressionBuilder.Internal.ArgumentValidation.GetExpectedParameters(System.Data.Metadata.Edm.EdmFunction)

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internal static DbExpressionList ValidateFunctionAggregate(EdmFunction function, IEnumerable<DbExpression> args)
        {
            //
            // Verify that the aggregate function is from the metadata collection and data space of the command tree.
            //
            ArgumentValidation.CheckFunction(function);

            // Verify that the function is actually a valid aggregate function.
            // For now, only a single argument is allowed.
            if (!TypeSemantics.IsAggregateFunction(function) || null == function.ReturnParameter)
            {
                throw EntityUtil.Argument(System.Data.Entity.Strings.Cqt_Aggregate_InvalidFunction, "function");
            }

            FunctionParameter[] expectedParams = GetExpectedParameters(function);
            DbExpressionList funcArgs = CreateExpressionList(args, "argument", expectedParams.Length, (exp, idx) =>
                {
                    TypeUsage paramType = expectedParams[idx].TypeUsage;
                    TypeUsage elementType = null;
                    if (TypeHelpers.TryGetCollectionElementType(paramType, out elementType))
                    {
                        paramType = elementType;
                    }

                    ArgumentValidation.RequireCompatibleType(exp, paramType, "argument");
                }
            );

            return funcArgs;
        }

internal static TypeUsage ValidateFunction(EdmFunction function, IEnumerable<DbExpression> arg/n ..... /n //View Source file for more details /n }