public void VisitorShouldResolveMethodName()
{
// arrange
Expression <Func <Entity, object> > expression = o => o.AuditInfo("test");
var visitor = new PropertyPathVisitor();
// act
visitor.Visit(expression);
// assert
Assert.Equal(nameof(Entity.AuditInfo), visitor.Name);
}
public void VisitorShouldResolvePropertyNameWithIndexer()
{
// arrange
Expression <Func <Entity, object> > expression = o => o.Items[0];
var visitor = new PropertyPathVisitor();
// act
visitor.Visit(expression);
// assert
Assert.Equal(nameof(Entity.Items), visitor.Name);
}
public void VisitorShouldResolvePropertyNameFromPath()
{
// arrange
Expression <Func <Entity, object> > expression = o => o.Items.Count;
var visitor = new PropertyPathVisitor();
// act
visitor.Visit(expression);
// assert
Assert.Equal(nameof(IList <object> .Count), visitor.Name);
}
public void VisitorShouldGenerateKeyWithIndexer()
{
// arrange
Expression <Func <Entity, object> > expression = o => o.Items[0];
var visitor = new PropertyPathVisitor();
var expected = $"{typeof( Entity ).FullName}.{nameof( Entity.Items )}_0";
// act
visitor.Visit(expression);
var actual = visitor.GenerateKey(typeof(Entity).FullName);
// assert
Assert.Equal(expected, actual);
}
public void VisitorShouldGenerateKeyWithParameter()
{
// arrange
Expression <Func <Entity, object> > expression = o => o.AuditInfo("test");
var visitor = new PropertyPathVisitor();
var expected = $"{typeof( Entity ).FullName}.{nameof( Entity.AuditInfo )}_test";
// act
visitor.Visit(expression);
var actual = visitor.GenerateKey(typeof(Entity).FullName);
// assert
Assert.Equal(expected, actual);
}
internal static string GetInstanceAnnotationKey <TObject, TProperty>(this Expression <Func <TObject, TProperty> > propertyExpression, out string name)
{
Contract.Requires(propertyExpression != null);
Contract.Ensures(!string.IsNullOrEmpty(Contract.Result <string>()));
var visitor = new PropertyPathVisitor();
// visit the expression and get the name of the first member (e.g. property or field)
visitor.Visit(propertyExpression);
// the expression wasn't valid; throw meaningful exception
if (string.IsNullOrEmpty(name = visitor.Name))
{
throw new ArgumentException(string.Format(CurrentCulture, InvalidAnnotationPropertyExpression, propertyExpression), nameof(propertyExpression));
}
// build unique key
return(visitor.GenerateKey(typeof(TObject).FullName));
}