public void TestConditional2()
{
Expression <Func <TestClassA, string> > path = a => a.B.S;
Expression <Func <TestClassA, bool> > condition = a => a.S == "zzz";
Expression assign = Expression.Assign(path.Body, Expression.Constant("qxx"));
Expression test = new ParameterReplacer(condition.Parameters[0], path.Parameters[0]).Visit(condition.Body);
Expression <Action <TestClassA> > exp = Expression.Lambda <Action <TestClassA> >(Expression.IfThenElse(test, assign, Expression.Default(typeof(void))), path.Parameters);
var action = LambdaCompiler.Compile(exp, CompilerOptions.All);
var o = new TestClassA {
S = "zzz"
};
action(o);
Assert.IsNotNull(o.B);
Assert.AreEqual(o.B.S, "qxx");
}
public void TestSubLambda4()
{
Expression <Func <TestClassA, IEnumerable <TestClassB> > > exp = a => a.ArrayB.Where(b => b.S == a.B.C.S);
Expression where = exp.Body;
ParameterExpression temp = Expression.Variable(typeof(IEnumerable <TestClassB>));
Expression assignTemp = Expression.Assign(temp, where);
Expression <Func <TestClassA, string> > path = a => a.B.C.S;
Expression left = new ParameterReplacer(path.Parameters[0], exp.Parameters[0]).Visit(path.Body);
Expression assignS = Expression.Assign(left, Expression.Constant("zzz"));
Expression any = Expression.Call(anyMethod.MakeGenericMethod(typeof(TestClassB)), temp);
var exp2 = Expression.Lambda <Func <TestClassA, bool> >(Expression.Block(typeof(bool), new[] { temp }, assignTemp, assignS, any), exp.Parameters);
var f = Compile(exp2, CompilerOptions.All);
Assert.IsTrue(f(new TestClassA {
ArrayB = new[] { new TestClassB {
S = "zzz"
}, }
}));
}