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c# - 非异步调用异步方法时出错

问题描述

我有以下异步方法：

[HttpGet]
[Route("api/SecurityRoles/AllowDeleteRole/{securityRoleId}")]
public async Task<IHttpActionResult> AllowDeleteRole(int securityRoleId)
{
    _systemLogger.LogInfo($"Method api/SecurityRoles/AllowDeleteRole (Get) called with securityRoleId: {securityRoleId}");

    var securityRolePermission =
            await _securityRolePermissionService.SecurityRolePermissionsCountBySecurityRoleId(securityRoleId);
    if (securityRolePermission != SecurityRoleDeleteResult.Success) return Ok(SecurityRoleDeleteResult.RolePermissionExists);

    var securityRolePageEntity =
            await  _securityRolePageEntityService.SecurityRolePageEntityCountBySecurityRoleId(securityRoleId);
    return Ok(securityRolePageEntity != SecurityRoleDeleteResult.Success ? SecurityRoleDeleteResult.RolePageEntityExists : SecurityRoleDeleteResult.Success);
    }

它在很多地方都被使用，但是对于这个实例，我需要非异步地使用它，所以我有以下代码首先包装它：

public async Task<SecurityRoleDeleteResult> AllowDeleteRole(int securityRoleId)
    {
        string url = $"{_housingDataSecurityConfiguration.HousingDataSecurityWebApiUrl}SecurityRoles/AllowDeleteRole/{securityRoleId}";
        var message =  _apiClientService.Retrieve<HttpResponseMessage>(url);

        if (message.StatusCode == HttpStatusCode.InternalServerError)
        {
            return SecurityRoleDeleteResult.ErrorOccurred;
        }

        int intResult = 0;
        var apiResult = await message.Content.ReadAsStringAsync();
        if (int.TryParse(apiResult, out intResult))
        {
            return (SecurityRoleDeleteResult)intResult;
        }
        else
        {
            return SecurityRoleDeleteResult.ErrorOccurred;
        }
    }

在被调用之前：

public  SecurityRoleViewModel BuildViewModelForEdit(int id)
{

    var enableButton = false;
    _securityRoleService.AllowDeleteRole(id).ContinueWith(result =>
        {
            enableButton = (result.Result == SecurityRoleDeleteResult.Success) ? true : false;

    });

    SecurityRoleViewModel model = new SecurityRoleViewModel()
    {
        SecurityRole = _securityRoleService.SecurityRoleRetrieve(id),
        RolePermissions = _securityRoleService.SecurityRolePermissionsRetrieve(id),
        EnableDeleteButton = enableButton 
    };
    return model;
}

我的问题是，当我尝试EnableDeleteButton = enableButton在模型中设置时，它会在线上抛出以下错误：

enableButton = (result.Result == SecurityRoleDeleteResult.Success) ? true : false;

{“将值 3 转换为类型 'System.Net.Http.HttpResponseMessage' 时出错。路径 ''，第 1 行，位置 1。”}

3 指的是我的 SecurityRoleDeleteResult 枚举中的枚举值之一。

标签： c#asynchronousasp.net-web-api

解决方案

AllowDeleteRole返回一个HttpResponseMessage。result您传递给 Lambda的对象是 Type Task<IHttpActionResult>。所以当你做result.Result你现在正在使用的对象时，IHttpActionResult更具体地说，它是一个HttpResponseMessage它出现的对象。

这是你的问题的原因

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