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我想要了解如何在StructureMap中使用策略工作的example 2。我創建了一個小測試項目（代碼如下）。不幸的是由於某種原因，似乎有一些依賴性問題，因爲.As<type>和.Each都不起作用。在StructureMap中使用策略的示例缺少依賴關係
對於使用As如
user.Green.As<Database>().ConnectionString.ShouldBe("*green*");
我收到錯誤行：
'IDatabase' does not contain a definition for 'As' and no extension method 'As' accepting a first argument of type 'IDatabase' could be found (are you missing a using directive or assembly reference?). And for this line:
instance.Constructor.GetParameters()
.Where(x => x.ParameterType == typeof(IDatabase))
.Each(param => ...
'StringExtensions.Each(IEnumberable,Action)' is inaccessible due to its protection level.
我安裝StructureMap 4.2使用的NuGet。正如你在下面的代碼中看到的那樣，我把所有可以找到的StructureMap中的所有using表達式都放進去了，但是我仍然遇到了這個問題。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using StructureMap;
using StructureMap.Pipeline;
using StructureMap.Pipeline.Lazy;
using StructureMap.Configuration;
using StructureMap.Building;
using StructureMap.Attributes;
using StructureMap.AutoMocking;
using StructureMap.Graph;
using StructureMap.Query;
using StructureMap.TypeRules;
using StructureMap.Util;
using StructureMap.Building.Interception;
using StructureMap.Configuration.DSL;
using StructureMap.Diagnostics.TreeView;
using StructureMap.Graph.Scanning;
namespace TestStructureMapPolicies
{
class Program
{
static void Main(string[] args)
{
var container = new Container(_ =>
{
_.For<IDatabase>().Add<Database>().Named("red")
.Ctor<string>("connectionString").Is("*red*");
_.For<IDatabase>().Add<Database>().Named("green")
.Ctor<string>("connectionString").Is("*green*");
_.Policies.Add<InjectDatabaseByName>();
});
// ImportantService should get the "red" database
container.GetInstance<ImportantService>()
.DB.As<Database>().ConnectionString.ShouldBe("*red*");
// BigService should get the "green" database
container.GetInstance<BigService>()
.DB.As<Database>().ConnectionString.ShouldBe("*green*");
// DoubleDatabaseUser gets both
var user = container.GetInstance<DoubleDatabaseUser>();
user.Green.As<Database>().ConnectionString.ShouldBe("*green*");
user.Red.As<Database>().ConnectionString.ShouldBe("*red*");
}
}
public interface IDatabase { }
public class Database : IDatabase
{
public string ConnectionString { get; set; }
public Database(string connectionString)
{
ConnectionString = connectionString;
}
public override string ToString()
{
return string.Format("ConnectionString: {0}", ConnectionString);
}
}
public class InjectDatabaseByName : ConfiguredInstancePolicy
{
protected override void apply(Type pluginType, IConfiguredInstance instance)
{
instance.Constructor.GetParameters()
.Where(x => x.ParameterType == typeof(IDatabase))
.Each(param =>
{
// Using ReferencedInstance here tells StructureMap
// to "use the IDatabase by this name"
var db = new ReferencedInstance(param.Name);
instance.Dependencies.AddForConstructorParameter(param, db);
});
}
}
public class BigService
{
public BigService(IDatabase green)
{
DB = green;
}
public IDatabase DB { get; set; }
}
public class ImportantService
{
public ImportantService(IDatabase red)
{
DB = red;
}
public IDatabase DB { get; set; }
}
public class DoubleDatabaseUser
{
public DoubleDatabaseUser(IDatabase red, IDatabase green)
{
Red = red;
Green = green;
}
// Watch out for potential conflicts between setters
// and ctor params. The easiest thing is to just make
// setters private
public IDatabase Green { get; private set; }
public IDatabase Red { get; private set; }
}
}