public void Block_SetVariable()
{
var int1 = Variable <int>("int1");
var int2 = Variable <int>("int2");
var expr = Block(
new ParameterExpression[] {
int2
},
new Expression[] {
Assign(int2, Constant(2)),
Assign(int1, int2)
});
var ctx = new ExpressionContext();
ctx.AddVariable <int>("int1", 1);
var result = Eval(expr, ctx);
Assert.IsTrue(ctx.ContainsVariable("int1"));
Assert.IsFalse(ctx.ContainsVariable("int2"));
Assert.AreEqual(2, ctx.GetVariable("int1"));
Assert.AreEqual(null, result);
}
public void Block_SetVariable2()
{
var ctx = new ExpressionContext();
ctx.AddVariable <int>("int1", 1);
var int2 = Variable <int>("int2");
var int3 = Variable <int>("int3");
var expr = Block(
new ParameterExpression[] { int2 },
new Expression[] {
Assign(int2, Constant(2)),
Block(new ParameterExpression[] { int3 },
new Expression[] {
Assign(int3, Constant(3)),
Assign(Variable <int>("int1"), Add(int2, int3))
})
});
//System.Linq.Expressions.Expression
var result = Eval(expr, ctx);
Assert.IsTrue(ctx.ContainsVariable("int1"));
Assert.IsFalse(ctx.ContainsVariable("int2"));
Assert.IsFalse(ctx.ContainsVariable("int3"));
Assert.AreEqual(5, ctx.GetVariable("int1"));
Assert.AreEqual(null, result);
}
private void TestVariable(string name, object value)
{
var ctx = new ExpressionContext();
ctx.AddVariable(value.GetType(), name, value);
Assert.IsTrue(ctx.ContainsVariable(name));
Assert.IsFalse(ctx.ContainsVariable("_" + name));
Assert.AreEqual(value, ctx.GetVariable(name));
}
