Generics IDatabase数据库=新的T（）；a=数据库。选择（新查询（“something1”、“something2”、“something3”）；返回a；}Select似乎不是IList的有效方法，您可以进一步说明吗？Select是在系统内声明的扩展方法。L

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IDatabase数据库=新的T（）；a=数据库。选择（新查询（“something1”、“something2”、“something3”）；返回a；}Select似乎不是IList的有效方法，您可以进一步说明吗？Select是在系统内声明的扩展方法。Linq命名空间：Select似乎不是IList的有效方法，您可以进一步说明吗？Select是在系统内声明的扩展方法。Linq命名空间：

public class foo
{
    private string a;
    private int b;
    private int c;
}

public string GetA<T>() where T: IDatabase
{
   //example might be GetA<RESTful>();
}

public int GetB<T>() where T: IDatabase
{
   //example might be GetB<MySQL>();
}

public object GetValue<T>(the class variable I want to query) where T: IDatabase
{
    //query database using type T and return it to the variable specified
}

public interface IDataProvider<T>
{
    T Get()
}

public class FootRestProvider : IDataProvider<Foo>
{
    public Foo Get()
    {
        // implement logic to get foos from rest
     }
}

public class FooMySqlProvider : IDataProvider<Foo>
{
    public Foo Get()
    {
        // implement logic to get foos from mysql
    }
}   

public class FooMerger
{
    // fill this list from constructor
    private IList<IDataProvider<Foo>> providers;

    public Foo Get()
    {
        var foosToMerge = providers.Select( x => x.Get() ).

        // implement merging logic here 
    }
}

public void GetValue<T>(string property) where T: IDatabase, new()
{
    IDatabase database = new T();
    database.RegisterObserver(this);

    string FROM = typeof(theCurrentClass).Name;
    string SELECT = editProperty = property;
    string WHERE = "1";

    database.Select(new Query(SELECT, FROM, WHERE));        
}

private string fieldName;  //contains the name of the field I want to edit

void IObserver.Update(object data)
{       
    FieldInfo field = this.GetType().GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance);

    if(field != null)
    {
        field.SetValue(this, data);         
    }
}