Question

我正在尝试弄清楚如何根据角色动态授权我的上下文。

public interface IConstraintResolver
{
    Expression<Func<TEntity, bool>>[] GetConstraintsForTypeByRole<TEntity>() 
        where TEntity : class;
}
public class AuthorizationContext : DbContext
{
    protected IConstraintResolver _constraintResolver;
    public AuthorizationContext(IConstraintResolver constraintResolver)
    {
        this._constraintResolver = constraintResolver;
    }

    public override DbSet<TEntity> Set<TEntity>()
    {
        var defaultSet = base.Set<TEntity>();

        var constraints = this._constraintResolver.GetConstraintsForTypeByRole<TEntity>();

        var filteredSet = base.Set<TEntity>().AsQueryable();

        foreach(var constraint in constraints)
        {
            filteredSet = filteredSet.Where(constraint);
        }

        //how do I apply this back to the innerQueryable
        return filteredSet;
    }
}

我的问题是，在应用了我的可查询后，如何使其成为Set的默认可查询。

我发现了一个与旧DbSet here

一起使用的陀螺

但.Net Core不包含IDBSet

如何创建自定义dbset，或者如何过滤现有dbSet？

Answer 1

通过global filters提供更好的方法：

  webview = (WebView) findViewById(R.id.webview);
        webview.loadUrl(url);
        contentView = (TextView) findViewById(R.id.contentView);

        //Main m=new Main(this);
       // m.passData();

        new Thread(new Runnable() {
            @Override
            public void run() {
                Document doc = null;
                //  Element element;
                try {
                    String url = "http://example.com/";
                    doc = Jsoup.connect(url).get();
                    e = doc.select("div.container").first().parents();
                    a = e.toString();

                } catch (IOException e) {
                    e.printStackTrace();
                }
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        contentView.setText(a);
                    }
                });
            }
        }).start();

Db通用资源授权

1 个答案: