IronPython: Accessing the .NET Field

The .NET libraries normally do not expose the public field, but we can still find its’ presence for certain scenarios. IronPython treats the .NET fields like python attribute. For python attribute, the typical operations are set, get and delete. In general, IronPython throws TypeError when deleting members of CLR types and their objects (so for…

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VisualStudio as my IronPython editor

The following steps are what I did to get Visual Studio ready as my IronPython (and IronRuby) editor. Install the latest internal dogfood build of Visual Studio 2008. you may use Visual Studio 2005 or download the VS 2008 public beta2; Download and install ASP.NET futures release (July 2007). This will give me the nice…

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IronPython: explicitly choose one method

C# allows method overloading. Given an argument list, the compiler performs the overload resolution to select the best method to invoke. The chosen method token is baked into the assembly. IronPython does the method resolution at the IronPython run time; for most scenarios, it has no problem in picking up the most reasonable one based…

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IronPython: Provide (or not) Argument for by-ref Parameter

Python function may return multiple objects as a tuple. The .NET method can only return one object as the result of a call; in order to return more than one objects, by-ref parameters are needed. They are decorated with the parameter modifier (ref, out) in C#. Dictionary.TryGetValue(TKey key, out TValue value) has an output parameter…

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IronPython: Keyword Argument to Set .NET Property/Field

Use keyword arguments to set properties or fields… you likely ask the question: where can we do this? IronPython allows it in the constructor call, the call against the .NET type. Such keyword should be the name of public field, or property (which is not read-only). After creating the object instance, each keyword argument value…

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IronPython: Passing Arguments for a Call

After getting a CLR type, we can play it like a python type. We can get the class/static methods using the dot operator (“attribute reference”) on the type, or create an instance of it and then get the instance methods. In Python’s word, these methods are callable objects, and we can make “calls” on them…

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IronPython: Grab the .NET Type

After loading the assembly by clr.AddReference and then import namespace, we are ready to take hold of types and down-level namespaces using “attribute references“. >>> import System>>> System.DateTime                    # type<type ‘DateTime’>>>> System.Diagnostics                 # still namespace<module ‘Diagnostics’ (CLS module, 2 assemblies loaded)>>>> System.Diagnostics.Debug           # type again<type ‘Debug’>>>> System.Diagnostics.CodeAnalysis    # namespace again<module ‘CodeAnalysis’ (CLS module from mscorlib,…

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IronPython: clr.AddReference

In order to interop with .NET libraries, we need first load in the assemblies we want to play with. The family of AddReference methods in the clr module serves the purpose. clr.AddReference clr.AddReferenceByName clr.AddReferenceByPartialName clr.AddReferenceToFile clr.AddReferenceToFileAndPath clr.AddReference accepts System.Reflection.Assembly objects and/or assembly names. The typical usage looks like: asm = … # any approach of…

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IronPython: import clr

clr is an IronPython built-in module, which provides some functionalities in order to interop with .NET. When writing “import clr” in a python module, it means you intend to leverage the .NET libraries. One classical example is python string’s methods. In IronPython, python type str is implemented by the .NET type System.String. We can call…

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DebuggerTypeProxy for IronPython Old-style Class and Instance

First I want to make it clear that this post means nothing related to IronPython’s plan about debugging python code in the future; it serves more as an interesting example to demonstrate DebuggerTypeProxyAttribute and how types can be created dynamically and be used in the VS debugger windows to display information the end users are…

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