public void VisitUnknownNonExtensionExpression_Ignored()
{
var expression = new UnknownExpression(typeof(object));
var result = MultiReplacingExpressionTreeVisitor.Replace(_mapping, expression);
Assert.That(result, Is.SameAs(expression));
}
private static LambdaExpression CreateSelectorForSelectNode(
LambdaExpression keySelector,
LambdaExpression elementSelectorOrResultSelector,
LambdaExpression resultSelectorOrNull)
{
var resultSelector = GetResultSelector(elementSelectorOrResultSelector, resultSelectorOrNull);
var optionalElementSelector = GetOptionalElementSelector(elementSelectorOrResultSelector, resultSelectorOrNull);
// If there is an element selector, the element type will be that returned by the element selector. Otherwise, it will be the type flowing into
// the key selector.
var elementType = optionalElementSelector != null ? optionalElementSelector.Body.Type : keySelector.Parameters[0].Type;
var groupingType = typeof(IGrouping <,>).MakeGenericType(keySelector.Body.Type, elementType);
var keyProperty = groupingType.GetProperty("Key");
var groupParameter = Expression.Parameter(groupingType, "group");
var keyExpression = Expression.MakeMemberAccess(groupParameter, keyProperty);
var expressionMapping = new Dictionary <Expression, Expression>(2)
{
{ resultSelector.Parameters[1], groupParameter },
{ resultSelector.Parameters[0], keyExpression }
};
var bodyWithGroupingAndKeyReplaced = MultiReplacingExpressionTreeVisitor.Replace(expressionMapping, resultSelector.Body);
return(Expression.Lambda(bodyWithGroupingAndKeyReplaced, groupParameter));
}
public void IgnoresTree_WhenReplacedNodesDoNotExist()
{
var tree = ExpressionHelper.CreateLambdaExpression();
var result = MultiReplacingExpressionTreeVisitor.Replace(_mapping, tree);
Assert.That(result, Is.SameAs(tree));
}
public void ReplacesGivenNode_ByReplacement()
{
var tree = _replacedNode2;
var result = MultiReplacingExpressionTreeVisitor.Replace(_mapping, tree);
Assert.That(result, Is.SameAs(_replacementNode2));
}
public void ReplacesTreeParts()
{
var tree = Expression.MakeBinary(ExpressionType.Add, _replacedNode1, _replacedNode2);
var result = MultiReplacingExpressionTreeVisitor.Replace(_mapping, tree);
var expectedResult = Expression.MakeBinary(ExpressionType.Add, _replacementNode1, _replacementNode2);
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void VisitExtensionExpression_DescendsIntoChildren()
{
var tree = new VBStringComparisonExpression(_replacedNode1, true);
var result = MultiReplacingExpressionTreeVisitor.Replace(_mapping, tree);
var expected = new VBStringComparisonExpression(_replacementNode1, true);
ExpressionTreeComparer.CheckAreEqualTrees(expected, result);
}
private Expression InlineLambdaExpression(LambdaExpression lambdaExpression, ReadOnlyCollection <Expression> arguments)
{
var mapping = new Dictionary <Expression, Expression>(arguments.Count);
var body = lambdaExpression.Body;
for (int i = 0; i < lambdaExpression.Parameters.Count; i++)
{
mapping.Add(lambdaExpression.Parameters[i], arguments[i]);
}
return(MultiReplacingExpressionTreeVisitor.Replace(mapping, body));
}
public void ReplacesTreePart_InSubQueries()
{
var replacedNode = ExpressionHelper.CreateQueryable <Cook> ().Expression;
var replacementNode = Expression.Constant(null, typeof(Cook[]));
var mapping = new Dictionary <Expression, Expression> {
{ replacedNode, replacementNode }
};
var subQueryMainFromClause = new MainFromClause("c", typeof(Cook), replacedNode);
var subQuery = ExpressionHelper.CreateQueryModel(subQueryMainFromClause);
var tree = new SubQueryExpression(subQuery);
MultiReplacingExpressionTreeVisitor.Replace(mapping, tree);
Assert.That(subQueryMainFromClause.FromExpression, Is.SameAs(replacementNode));
}
public static Expression Resolve <TParameter1, TParameter2, TResult> (
IQuerySource sourceToReference1,
IQuerySource sourceToReference2,
Expression <Func <TParameter1, TParameter2, TResult> > expressionToBeResolved)
{
ArgumentUtility.CheckNotNull("sourceToReference1", sourceToReference1);
ArgumentUtility.CheckNotNull("sourceToReference2", sourceToReference2);
ArgumentUtility.CheckNotNull("expressionToBeResolved", expressionToBeResolved);
var expressionMapping = new Dictionary <Expression, Expression> (2)
{
{ expressionToBeResolved.Parameters[0], new QuerySourceReferenceExpression(sourceToReference1) },
{ expressionToBeResolved.Parameters[1], new QuerySourceReferenceExpression(sourceToReference2) }
};
var result = MultiReplacingExpressionTreeVisitor.Replace(expressionMapping, expressionToBeResolved.Body);
return(result);
}
