| public static PropertyOrField ( Expression expression, string propertyOrFieldName ) : MemberExpression | ||
| expression | Expression | The containing object of the member. This can be null for static members. |
| propertyOrFieldName | string | The member to be accessed. |
| return | MemberExpression | |
public static MemberExpression PropertyOrField(Expression expression, string propertyOrFieldName)
{
RequiresCanRead(expression, nameof(expression));
// bind to public names first
PropertyInfo pi = expression.Type.GetProperty(propertyOrFieldName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.FlattenHierarchy);
if (pi != null)
return Property(expression, pi);
FieldInfo fi = expression.Type.GetField(propertyOrFieldName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.FlattenHierarchy);
if (fi != null)
return Field(expression, fi);
pi = expression.Type.GetProperty(propertyOrFieldName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.IgnoreCase | BindingFlags.FlattenHierarchy);
if (pi != null)
return Property(expression, pi);
fi = expression.Type.GetField(propertyOrFieldName, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.IgnoreCase | BindingFlags.FlattenHierarchy);
if (fi != null)
return Field(expression, fi);
throw Error.NotAMemberOfType(propertyOrFieldName, expression.Type, nameof(propertyOrFieldName));
}
public static Expression SelectPropertyValue(Type type, string property, List <string> values, QueryFilterExpressionCollection queryFilter)
{
var valueType = GetPropertyType(type, property);
var parsedValuesAsObjects = values.Select(v => TryConvert(v, valueType)).ToList();
var parsedValues = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(valueType));
foreach (var parsedValueAsObject in parsedValuesAsObjects)
{
parsedValues.Add(parsedValueAsObject);
}
var param = Expression.Parameter(type, "i");
Expression propertyExpression = param;
foreach (var member in property.Split('.'))
{
propertyExpression = Expression.PropertyOrField(propertyExpression, member);
}
var expression = queryFilter.GetQueryFilterExpression(GetPropertyInfo(type, property));
return(typeof(Lambda)
.GetMethod(nameof(Convert), BindingFlags.Static | BindingFlags.NonPublic)
.MakeGenericMethod(valueType, type)
.Invoke(null, new object[] { expression, parsedValues, propertyExpression, param })
as Expression);
}
