Question

我收到错误信息'运算符'=='无法应用于类型为'string'和'int？'的操作数在这条线上

public static func request(_ url: URLConvertible, method: Alamofire.HTTPMethod = .get, parameters: Parameters? = nil, encoding: ParameterEncoding = URLEncoding.default, headers: Alamofire.HTTPHeaders? = nil, interceptor: RequestInterceptor? = nil) -> Alamofire.DataRequest
// or
public static func request<Parameters>(_ url: URLConvertible, method: Alamofire.HTTPMethod = .get, parameters: Parameters? = nil, encoder: ParameterEncoder = URLEncodedFormParameterEncoder.default, headers: Alamofire.HTTPHeaders? = nil, interceptor: RequestInterceptor? = nil) -> Alamofire.DataRequest where Parameters : Encodable

到目前为止，除此方法外，我没有尝试任何其他方法。

      .FirstOrDefaultAsync(m => m.Id == id);

我的预期结果是，当我单击“视图”页面上的“删除”链接要求其确认删除，然后单击“是”或“否”时，它将执行DeleteConfirmed Action。我该如何解决此错误？

Answer 1

将Delete(int? id)更改为Delete(string id)，将DeleteConfirmed(int id)更改为DeleteConfirmed(string id)，如下所示：

public async Task<IActionResult> Delete(string id) // <-- Here it is
{
    if (id == null)
    {
        return NotFound();
    }

    var user = await db.Users.FirstOrDefaultAsync(m => m.Id == id);
    if (user == null)
    {
        return NotFound();
    }

    return View(user);
}

[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteConfirmed(string id) // <-- Here it is
{
    var user = await db.Users.FindAsync(id);
    db.Users.Remove(user);
    await db.SaveChangesAsync();
    return RedirectToAction(nameof(Index));
}

删除ActionResult .Net Core

1 个答案: