public Expression <Func <T, bool> > ResolveFilter <T>(EntityMetadataService <T> metadataService)
{
var leftExpression = this.Left.ResolveFilter(metadataService);
var rightExpression = this.Right.ResolveFilter(metadataService);
return(leftExpression.Combine(rightExpression, this.Combinor));
}
static void Main(string[] args)
{
var test = new TestData {
Length = 3, Name = "Win", Ethnicity = "Human"
};
var test1 = new TestData {
Length = 4, Name = "Lose", Ethnicity = "Human"
};
var test2 = new TestData {
Length = 5, Name = "Test", Ethnicity = "Human"
};
var test3 = new TestData {
Length = 6, Name = "Foo", Ethnicity = "Human"
};
var filterableData = new List <TestData> {
test, test1, test2, test3
};
var simpleFilter = new FilterParameterDTO
{
PropertyName = nameof(TestData.Name),
FilterCondition = FilterCondition.Equal,
Value = "Win"
};
var entityMetadataService = new EntityMetadataService <TestData>(testDataWhiteList);
var expressionFilter = simpleFilter.ResolveFilter(entityMetadataService);
var results = filterableData.AsQueryable().Where(expressionFilter).ToList();
Console.WriteLine($"Number of Results {results.Count}");
Console.WriteLine($"Is Expected Result: { results.First().Equals(test)}");
var simpleFilter2 = new FilterParameterDTO
{
PropertyName = nameof(TestData.Length),
FilterCondition = FilterCondition.Equal,
Value = "6"
};
var binaryExpression = new BinaryExpressionDTO {
Left = simpleFilter, Right = simpleFilter2, Combinor = ExpressionCombine.Or
};
var binaryExpressionFilter = binaryExpression.ResolveFilter(entityMetadataService);
results = filterableData.AsQueryable().Where(binaryExpressionFilter).ToList();
Console.WriteLine($"Number of Results {results.Count}");
Console.WriteLine($"Is Expected First Result { results.First().Equals(test)}");
Console.WriteLine($"Is Expected Second Result { results.Skip(1).First().Equals(test3)}");
Console.ReadLine();
}
public Expression <Func <T, bool> > ResolveFilter <T>(EntityMetadataService <T> metadataService)
{
var memberExpression = metadataService.GetMemberExpression(this.PropertyName);
return(memberExpression.BuildBinaryExpression <T>(this.FilterCondition, this.Value));
}
