Detecting Debug mode on Net Core

To detect if the Assembly is on Debug mode: Using reflection bool debugMode = false; // Detect debug mode if (attribs.Length > 0) { var debuggableAttribute = attribs[0] as DebuggableAttribute; if (debuggableAttribute != null) { debugMode = debuggableAttribute.IsJITOptimizerDisabled ? true : false; } } Using csproj constants Another solution is to use DEBUG constants, so …

C# (Net Core) – Display Friendly Name for Enumerator

To display a friendly name for enumerator element, we can use the Description annotation (we need to include the System.ComponentModel  namespace): using System.ComponentModel; public enum MyEnum { [Description("Success")] Success = 0, [Description("Error")] Error = 1 } Now we can use the normal  ToString()  to obtain the friendly name of the enumerator: MyEnum.Success.Success.ToString()

LINQ – Search into a List a joined string

If we have a string whose values are joined with a character (for example a comma) we can use the condition Any to determine if some element of the sequence satisfies a condition and use the Contains in the condition to find the string. // joined string string values = "value1,value2"; // sequence List<string> searchList …

C#: create proxy class from WSDL

If we have a WSDL file and we want to create the C# proxy class we can use the svcutil.exe (Windows SDK ServiceModel Metadata Utility Tool). Suppose we have saved the WSDL file InteropService.wsdl into the folder C:\Tmp. We can execute this command to create the C# proxy class: "C:\Program Files (x86)\Microsoft SDKs\Windows\v10.0A\bin\NETFX 4.6.2 Tools\svcutil.exe" …

C# – Remove UtcOffset from DateTime

DateTime contains UTC format informations. To remove UTC informations we need to create an instance of DateTime using its Ticks property. For example: // DateTime that contains UTC info DateTime date = DateTime.Now; date.ToString("o"); // Output "2018-12-07T15:58:01.4217891+01:00" // DateTime without UTC info date = new DateTime(date.Ticks); date.ToString("o"); // Output "2018-12-07T15:58:01.4217891"

C#: how to convert a String to DateTime ignoring TimeZone

To convert a String into a DateTime we can use the DateTime.Parse method. For example: DateTime myDt = DateTime.Parse("2018-10-02 11:25:27.860"); Now the myDt contains a date with 02/10/2018 11:25:27 value (on italian format). But if our string date include TimeZone informations, if we use DateTime.Parse method, we get a wrong value: DateTime myDt = DateTime.Parse("2018-10-02T11:25:27.860Z"); Now …

C#: how to validate XML with a set of XSD schemas

When we are using an XSD schema to validate an XML document, if this schema has other nested XSD schemas, if we have a myCustomType declared into the nested XSD and we don't use XmlSchemaSet to validating the XML, we can get the error: Type 'myCustomType' is not declared For example, if we have the myCustomType defined …

Asp Net Core 2 – Angular: download file from Controller

If we have an Angular client app that needs to download a file (for example a PDF file) from an Asp Net Core 2 api Controller , we can follow what is described in this post. The first implementation is on the server side (an Asp Net Core 2 Controller). So, for example into our controller UserController, …

C#: get anonimous properties length

To get the number of the properties contained by an objects collection (even Anonymous) like the following: var data = new [] { new { Name="Ram", Email="ram@techbrij.com", Phone="111-222-3333" }, new { Name="Shyam", Email="shyam@techbrij.com", Phone="159-222-1596" }, new { Name="Mohan", Email="mohan@techbrij.com", Phone="456-222-4569" }, new { Name="Sohan", Email="sohan@techbrij.com", Phone="789-456-3333" }, new { Name="Karan", Email="karan@techbrij.com", Phone="111-222-1234" }, new { Name="Brij", …

LINQ – IEnumerable .Count() threw an exception of type ‘System.NullReferenceException’

When we execute a LINQ query to an objects collection, LINQ uses deferred execution and the actual LINQ query will not be executed until we call .Count(), .ToList(), etc. (this can be checked looking the SQL command logs executed by the LINQ to SQL, following the instructions given in this post). If our objects collection contains …

Net Core 2.0: resolve error “The source IQueryable doesn’t implement IAsyncEnumerable. Only sources that implement IAsyncEnumerable can be used for Entity Framework asynchronous operations.”.

Because ToListAsync() works on a IQueryable<T> only, when you turned it in to a IEnumerable<T> via AsEnumerable() you lost the ability to call it. So wath appen if you try to call .AsQueryable()ToListAsync() on a IEnumerable<T> sequence like in the following example? public class SampleController { public class PeopleType { public string Name { get; set; } …

Linq: resolve error ‘Cannot implicitly convert type System.Linq.IQueryable to System.Threading.Tasks.Task<System.Linq.IQueryable>

When we write a Linq method that return an IQueryable object collection like this: private Task<IQueryable<SampleType>> GetSampleType (IQueriable sampleCollection) { // A simple Linq query var result = from r in sampleCollection where (r.Type = 1) select new SampleType { Name = r.Name, Type = r.Type }; return result; } We get this error: Cannot …

Linq: order list of versions

If we have a queryable of entities with a version field (for example a "Code" field), when we try to order the the result the processing is carried out based on the comparison of strings: class VersioField { public string Code { get; set; } } private void VersionOrder() { List<VersioField> lst1 = new List<VersioField>() …

C#: get all types that implement an interface with reflection

Using reflection, from C# 3.0 and above, is possible to get all types that implement an interface. For example if the interface is IMyInterface: var type = typeof(IMyInterface); var types = AppDomain.CurrentDomain.GetAssemblies()     .SelectMany(s => s.GetTypes())     .Where(p => type.IsAssignableFrom(p)); foreach (var type in types) {     //do stuff } Or another …

C# – LINQ: concat IQueriable lists

To merge two IQueryable lists we can use the Concat method that is a Linq operator. This method doesn't change the existing sequence but returns a new sequence. So we need to assign the sequence returned by the Concat method to the list where we want the concatenation: // GetValues is our custom method that …