public void TypeBasedExpressionRewriter_NoChange()
{
foreach (var e in new Expression[]
{
Expression.Constant(1L, typeof(long)),
(Expression <Func <DateTimeOffset> >)(() => DateTimeOffset.Now),
(Expression <Func <IEnumerable <long>, IEnumerable <string> > >)(xs => from x in xs where x % 2 == 0 select x.ToString())
})
{
var rewriter = new TestRewriter();
Assert.AreSame(e, rewriter.Visit(e));
}
}
public void TypeBasedExpressionRewriter_NoChange()
{
foreach (var e in new Expression[]
{
Expression.Constant(1L, typeof(long)),
#pragma warning disable IDE0004 // Remove Unnecessary Cast. (Only unnecessary on C# 10 or later.)
(Expression <Func <DateTimeOffset> >)(() => DateTimeOffset.Now),
#pragma warning restore IDE0004
(Expression <Func <IEnumerable <long>, IEnumerable <string> > >)(xs => from x in xs where x % 2 == 0 select x.ToString())
})
{
var rewriter = new TestRewriter();
Assert.AreSame(e, rewriter.Visit(e));
}
}
public void TypeBasedExpressionRewriter_Simple()
{
var f = new Foo {
Value = 42
};
foreach (var e in new Dictionary <Expression, Expression>
{
{ Expression.Constant(f, typeof(Foo)), Expression.Convert(Expression.Constant(f, typeof(Foo)), typeof(Bar)) },
{ (Expression <Func <Foo, Foo> >)(x => x.Other), (Expression <Func <Foo, Foo> >)(x => (Bar)((Bar)x).Other) },
{ (Expression <Func <Foo, Foo> >)(x => x), (Expression <Func <Foo, Foo> >)(x => (Bar)x) },
#pragma warning disable IDE0004 // Remove Unnecessary Cast. (Keeping inside expression tree.)
{ (Expression <Func <List <int>, IEnumerable <int> > >)(x => (IEnumerable <int>)x), (Expression <Func <List <int>, IEnumerable <int> > >)(x => (IEnumerable <int>)(IEnumerable <int>) x) },
#pragma warning restore IDE0004
})
{
var comparer = new ExpressionEqualityComparer();
var rewriter = new TestRewriter();
Assert.IsTrue(comparer.Equals(rewriter.Visit(e.Key), e.Value));
}
}
