I'm just trying make the same expression like below using Linq.Expression:
Expression<Func<Organization, bool>> expression = @org => @org.OrganizationFields.Any(a => a.CustomField.Name == field.Name && values.Contains(a.Value));
In this example above I have an entity called Organization and it has a property called OrganizationsFields as IEnumerable and I want to find any occurrence that match with Any parameter expression.
I just using the code below to generate expression dynamically:
string[] values = filter.GetValuesOrDefault();
ParameterExpression parameter = Expression.Parameter(typeof(T), "org");
Expression organizationFields = Expression.Property(parameter, "OrganizationFields");
MethodInfo any = typeof(Enumerable)
.GetMethods()
.FirstOrDefault(a => a.Name == "Any" && a.GetParameters().Count() == 2)
.MakeGenericMethod(typeof(OrganizationField));
Func<OrganizationField, bool> functionExpression = a => a.CustomField.Name == filter.Name && values.Contains(a.Value);
Expression functionParam = Expression.Constant(functionExpression, typeof(Func<OrganizationField, bool>));
Expression call = Expression.Call(organizationFields, any, functionParam);
return Expression.Lambda<Func<T, bool>>(call, parameter);
The problems occur when I call the method Expression.Call it throw an ArgumentExeption
Can anyone help me?
Regards
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