Created
October 2, 2017 10:43
-
-
Save BrightShadow/12ac85e61d1b3e7f1bff684aa5bc326c to your computer and use it in GitHub Desktop.
Class that allows to get rid of Locator in MVVM/WPF - automatic view models resolving in runtime
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
using Microsoft.Practices.Unity; | |
using System; | |
using System.Collections.Generic; | |
using System.Reflection; | |
using System.Windows; | |
using System.Windows.Markup; | |
namespace PP.Blog.WpfViewModelsResolver | |
{ | |
class ViewModelsResolver | |
{ | |
public void ConfigureViewModels(IUnityContainer container) | |
{ | |
Assembly currentAssembly = Assembly.GetCallingAssembly(); | |
IEnumerable<Type> allAssemblyTypes = currentAssembly.GetTypes(); | |
foreach (var type in allAssemblyTypes) | |
{ | |
if (this.ViewModelNamesOnly(type) != null) | |
{ | |
Type viewType = this.GetMatchingViewType(type); | |
if (viewType != null) | |
{ | |
this.AddDataTemplate(viewType, type); | |
} | |
Type interfaceType = this.GetMatchingInterfaceType(type); | |
if (interfaceType != null) | |
{ | |
container.RegisterType(interfaceType, type); | |
} | |
} | |
} | |
} | |
private Type GetMatchingInterfaceType(Type viewModelType) | |
{ | |
var typeName = viewModelType.FullName; | |
var namespacePath = typeName.Substring(0, typeName.Length - viewModelType.Name.Length); // Get namespace path | |
var interfaceTypeName = namespacePath + "I" + viewModelType.Name; | |
return viewModelType.Assembly.GetType(interfaceTypeName, false); | |
} | |
private Type GetMatchingViewType(Type viewModelType) | |
{ | |
var typeName = viewModelType.FullName; | |
var viewTypeName = typeName.Substring(0, typeName.Length - "Model".Length); // Get matching | |
return viewModelType.Assembly.GetType(viewTypeName, false); | |
} | |
private string ViewModelNamesOnly(Type type) | |
{ | |
string typeName = type.FullName; | |
if (typeName.EndsWith("ViewModel") && !type.IsInterface) | |
{ | |
return type.Name; | |
} | |
return null; | |
} | |
private void AddDataTemplate(Type viewType, Type viewModelType) | |
{ | |
DataTemplate dataTemplate = this.CreateTemplate(viewType, viewModelType); | |
if (!Application.Current.Resources.Contains(dataTemplate.DataTemplateKey)) | |
{ | |
Application.Current.Resources.Add(dataTemplate.DataTemplateKey, dataTemplate); | |
} | |
else | |
{ | |
Console.WriteLine("Duplicated resource key: " + dataTemplate.DataTemplateKey.ToString()); | |
} | |
} | |
private DataTemplate CreateTemplate(Type viewType, Type viewModelType) | |
{ | |
const string xamlTemplate = | |
"<DataTemplate DataType=\"{{x:Type xViewModels:{0}}}\"><xViews:{1}></xViews:{1}></DataTemplate>"; | |
var xaml = String.Format(xamlTemplate, viewModelType.Name, viewType.Name); | |
var context = new ParserContext(); | |
context.XamlTypeMapper = new XamlTypeMapper(new string[0]); | |
context.XamlTypeMapper.AddMappingProcessingInstruction("xViewModels", viewModelType.Namespace, viewModelType.Assembly.FullName); | |
context.XamlTypeMapper.AddMappingProcessingInstruction("xViews", viewType.Namespace, viewType.Assembly.FullName); | |
context.XmlnsDictionary.Add("", "http://schemas.microsoft.com/winfx/2006/xaml/presentation"); | |
context.XmlnsDictionary.Add("x", "http://schemas.microsoft.com/winfx/2006/xaml"); | |
context.XmlnsDictionary.Add("xViewModels", "xViewModels"); | |
context.XmlnsDictionary.Add("xViews", "xViews"); | |
return (DataTemplate)XamlReader.Parse(xaml, context); | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment