public static IDictionary <PropertyInfo, PropertyInfo> GetSelectedProperty(Expression exp)
{
PropertyPairSelectorVisitor visitor = new PropertyPairSelectorVisitor();
visitor.Visit(exp);
return(visitor.Properties);
}
public void LambdaExpressionHasNotTwoParameters_ThrowException()
{
// Arrange
Expression <Func <Dependent, int> > expr = d => d.ForeignKey1;
// Act & Assert
Assert.Throws <InvalidOperationException>(() => PropertyPairSelectorVisitor.GetSelectedProperty(expr),
SRResources.LambdaExpressionMustHaveExactlyTwoParameters);
}
public void UnsupportedExpressionNodeType_ThrowException()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr = (d, p) => d.ForeignKey1 > p.PrincipalKey1;
// Act & Assert
Assert.Throws <NotSupportedException>(() => PropertyPairSelectorVisitor.GetSelectedProperty(expr),
"Unsupported Expression NodeType 'GreaterThan'.");
}
public void LambdaExpressionAccessesNotProperty_ThrowException()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr = (d, p) => d.ForeignKey1 == p.Field;
// Act & Assert
Assert.Throws <InvalidOperationException>(() => PropertyPairSelectorVisitor.GetSelectedProperty(expr),
string.Format("Member '{0}.Field' is not a property.", typeof(Principal).FullName));
}
public void MemberExpressionNotBoundToParameter_ThrowException()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr =
(d, p) => new Dependent().ForeignKey1 == new Principal().PrincipalKey1;
// Act & Assert
Assert.Throws <InvalidOperationException>(() => PropertyPairSelectorVisitor.GetSelectedProperty(expr),
"MemberExpressions must be bound to the LambdaExpression parameter.");
}
public void CanWork_WithNullValue()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr = null;
// Act
IDictionary <PropertyInfo, PropertyInfo> properties =
PropertyPairSelectorVisitor.GetSelectedProperty(expr);
// Assert
Assert.Equal(0, properties.Count);
}
public void MemberExpressionTypeNotMatch_ThrowException()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr =
(d, p) => d.ForeignKey4 == p.PrincipalKey1;
// Act & Assert
Assert.Throws <InvalidOperationException>(() => PropertyPairSelectorVisitor.GetSelectedProperty(expr),
String.Format(SRResources.EqualExpressionsMustHaveSameTypes,
typeof(Dependent).FullName, "ForeignKey4", "System.Int16",
typeof(Principal).FullName, "PrincipalKey1", "System.Int32"));
}
public void CanGetSingleSelectedPropertyPair()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr = (d, p) => d.ForeignKey1 == p.PrincipalKey1;
// Act
IDictionary <PropertyInfo, PropertyInfo> properties =
PropertyPairSelectorVisitor.GetSelectedProperty(expr);
// Assert
Assert.Equal(1, properties.Count);
Assert.Equal("ForeignKey1", properties.Keys.First().Name);
Assert.Equal("PrincipalKey1", properties.Values.First().Name);
}
public void CanGetMultiSelectedPropertyPairs()
{
// Arrange
Expression <Func <Dependent, Principal, bool> > expr =
(d, p) => d.ForeignKey1 == p.PrincipalKey1 && d.ForeignKey2 == p.PrincipalKey2;
// Act
IDictionary <PropertyInfo, PropertyInfo> properties =
PropertyPairSelectorVisitor.GetSelectedProperty(expr);
// Assert
Assert.Equal(2, properties.Count);
Assert.Equal("PrincipalKey1", properties[typeof(Dependent).GetProperty("ForeignKey1")].Name);
Assert.Equal("PrincipalKey2", properties[typeof(Dependent).GetProperty("ForeignKey2")].Name);
}
public NavigationPropertyConfiguration HasRequired <TTargetEntity>(
Expression <Func <TEntityType, TTargetEntity> > navigationPropertyExpression,
Expression <Func <TEntityType, TTargetEntity, bool> > referentialConstraintExpression) where TTargetEntity : class
{
NavigationPropertyConfiguration navigation =
GetOrCreateNavigationProperty(navigationPropertyExpression, EdmMultiplicity.One);
IDictionary <PropertyInfo, PropertyInfo> referentialConstraints =
PropertyPairSelectorVisitor.GetSelectedProperty(referentialConstraintExpression);
foreach (KeyValuePair <PropertyInfo, PropertyInfo> constraint in referentialConstraints)
{
navigation.HasConstraint(constraint);
}
return(navigation);
}
