Noble Programming Mantra

    TypeScript icon, indicating that this package has built-in type declarations

    1.7.5 • Public • Published


    .Net Framework support in javascript

    Get DotnetJs

    1. Nodejs

      firstly, run npm install dotnetjs --save

      If you are using typescript:

      import * as DotnetJs from 'dotnetjs';

      else just like the others:

      var DotnetJs = require('dotnetjs');
    2. Browser

      run npm install dotnetjs --save

      or download the files in the dist directory.

      or run bower install dotnetjs

      <!--if debug-->
      <script src="dotnet.js"></script>
      <!--if release-->
      <script src="dotnet.min.js"></script>
      <script src="your.js"></script>

      in your .ts file:

      /// <reference path="dotnet.d.ts" />

    Work with DotnetJs

    DotnetJs uses similiar interface as it is in .Net Framework.


    If you are about to use complicated Linq Expressions, first make a instance of LinqIntermediate by using LinqStart:

    var expression = DotnetJs.Linq.LinqStart(enumerable);

    the enumerable can be any type that implements IEnumerable, in addition, I implemented it for the Array. Then you can do like the following:


    Or use:

    DotnetJs.Linq.Where(enumerable, ...).Select(...).ToArray();

    remember to use ToArray or ToList or ToDictionary to end the expression(if the result is still IEnumerable). No matter how long your linq is, the time complexity is always O(n).

    String Format

    The match case: {index[,alignment][:format]}, with 2 optional parameters (alignment and format).

    1. index

      Index indicate the index of the object in the following parameter args[].

    2. alignment

      Alignment will do PadLeft or PadRight with spaces, if it is positive then do PadLeft, else do PadRight.

    3. format

      With the magic char ':', you can control the format of your toString method. For number, there are specifiers ['D', 'E', 'F', 'G', 'N', 'P', 'X'] implemented, usage portal. Now, let's see the following example:

      var number = 1.0437E21;
      var specifier = 'G';
      console.writeLine("   {0,-22} {1:G}", specifier + ":", number);
      // output:   G:                     1.0437e+21
      class Foo {
          public bar: number;
          public toString(format: string) {
              if (format == null)
              if (format == '!')
                  return '!' +;
              return '?' +;
      var foo = new Foo(); = 65521;
      console.log(String.Format('test Foo toString: {0:!}, {0:?}, {0,10}', foo));
      // output: test Foo toString: !65521, ?65521,      65521

    Indexer for the collections

    As there isn't have a way to implement indexer in typescript. You have to call the element of List or IDictionay, by using GetValue(index || key) and SetValue(index || key, value), but not collection[index || key].


    Both object, string, boolean or number are supported for the GetHashCode Method, actually for the object, it is more likely to be called as a 'unique id'.

    To get a new hashcode for an object, call the method with parameter 'ture'. But please becareful, this may due to unexpected errors (e.g.: when you are using Dictionary).


    If you inherit from typescript abstract class ValueType, remember to override Equals method, else it will compare the result of GetHashCode() to decide whether it equals to the other.


    var obj = { name: 'readme' };
    // output: true


    More extensions. If you have any idea, please feel free to contact me.


    Change directory to tests, then run tsc to compile the typescript files, then run npm link ../ secondly, to set up the local dependence, finally run node index.js to start the test.


    Master76 Author

    AsherWang RegExp suport


    npm i dotnetjs

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