public static Expression <Func <bool> > Apply <T>(Expression <Func <T, bool> > expr, object value)
{
var paramExprToReplace = expr.Parameters[0];
var valueToApply = Expression.Constant(value, value.GetType());
var visitor = new PartialApplicationVisitor(paramExprToReplace, valueToApply);
var oldBody = expr.Body;
var newBody = visitor.Visit(oldBody);
return(Expression.Lambda <Func <bool> >(newBody));
}
public IEnumerable <ExpectationResult> Assert(object fromWhen)
{
var partiallyApplied = PartialApplicationVisitor.Apply(_expression, fromWhen);
ExpectationResult result;
try
{
PAssert.PAssert.IsTrue(partiallyApplied);
result = (new ExpectationResult {
Passed = true, Text = PAssert.PAssert.CreateSimpleFormatFor(partiallyApplied), OriginalExpression = _expression
});
}
catch (Exception ex)
{
result = (new ExpectationResult {
Passed = false, Text = PAssert.PAssert.CreateSimpleFormatFor(partiallyApplied), OriginalExpression = _expression, Exception = ex
});
}
yield return(result);
}