66 lines
2.0 KiB
C#
66 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Collections;
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using System.Dynamic;
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namespace umbraco.MacroEngines
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{
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//This type is used as a return type when TryGetMember fails on a DynamicNode
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//.Where explicitly checks for this type, to indicate that nothing was returned
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//Because it's IEnumerable, if the user is actually trying @Model.TextPages or similar
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//it will still return an enumerable object (assuming the call actually failed because there were no children of that type)
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//but in .Where, if they use a property that doesn't exist, the lambda will bypass this and return false
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public class DynamicNull : DynamicObject, IEnumerable
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{
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public IEnumerator GetEnumerator()
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{
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return (new List<DynamicNull>()).GetEnumerator();
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}
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public DynamicNull Where(string predicate, params object[] values)
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{
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return this;
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}
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public DynamicNull OrderBy(string orderBy)
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{
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return this;
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}
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public int Count()
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{
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return 0;
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}
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public override string ToString()
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{
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return string.Empty;
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}
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public override bool TryGetMember(GetMemberBinder binder, out object result)
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{
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result = this;
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return true;
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}
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public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
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{
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result = this;
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return true;
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}
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public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
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{
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result = this;
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return true;
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}
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public bool IsNull()
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{
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return true;
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}
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public bool HasValue()
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{
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return false;
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}
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public static implicit operator bool(DynamicNull n)
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{
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return false;
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}
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}
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}
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