小编And*_*rew的帖子

我有一个ReturnStatementDetailsForSubRepAsync使用 linq 表达式的函数 ( )，我可以使用诸如.ToListAsync(). 现在因为这个 LINQ 函数是异步的，所以我必须使父函数异步。

父函数如下所示：

public async Task<IEnumerable<StatementDetail>> ReturnStatementDetailsAsync(string cid, string userName, int statementNo)
{
    var statementDetails = new List<StatementDetail>;
    if (HttpContext.Current.User.IsInRole(UserLevel.Subrep.GetDescription()) || HttpContext.Current.User.IsInRole(UserLevel.SubRepMaster.GetDescription()))
    {
        var subRepStmtDetails = await ReturnStatementDetailsForSubRepAsync(cid, userName, statementNo); //Linq query with ToListAsync()
        foreach (var item in subRepStmtDetails)
        {
            statementDetails.Add(new SubRepStatementDetailItem(item));
        }
    }
    else
    {
        var regionalStmtDetails = await Task.Run(() => StoredPrcedureAsyncTest(cid, statementNo); //Entity framework stored procedure call
        foreach (var item in regionalStmtDetails)
        {
            statementDetails.Add(new RegionalStatementDetailItem(item));
        }
    }

    return …

Public Class LoginManager
    Implements ILoginManager
    Private ReadOnly _iLoginRepository As ILoginRepository
    Public Sub New()
        _iLoginRepository = New LoginRepository()
    End Sub

    Public Async Sub InsertFailedLoginAttempt(failedLoginAttempt As FailedLogin) Implements ILoginManager.InsertFailedLoginAttempt
        'Example of the S in Solid (Single Repsonsibilty)
        'Need to call these method async. But await errors 
            _iLoginRepository.InsertFailedLoginAttemptAsync(failedLoginAttempt)
            _iLoginRepository.InsertFailedLoginAttemptIntoLoginMasterAsync(failedLoginAttempt)
        End Sub
    End Class

资源库接口：

Public Interface ILoginRepository
    Function IsUserAuthenticatedAsync(ByVal cID As String, ByVal password As String, ByVal IsExternalUser As Boolean) As Task(Of Boolean)
    Sub InsertFailedLoginAttemptAsync(ByVal failedLoginAttempt As FailedLogin)
    Sub InsertFailedLoginAttemptIntoLoginMasterAsync(ByVal failedLoginAttempt As FailedLogin) …

我遇到了一个问题，我正在创建一个List<SelectListItem>withoptgroups但不是创建optgroup每个组，SelectListItem而是创建一个新的SelectListGroupper SelectListItem。这让我有点困惑，因为SelectListGroup我的代码中没有任何重复的's。

下面是一个例子：

预期结果：

<select datatag="data-States=''" class="form-control filter-select" data-multi-select="" id="States" multiple="multiple" name="States">
    <optgroup label="MA">
    <option value="01602">01602</option>
    <option value="02743">02743</option>
    <option value="01107">01107</option>
    </optgroup>
    </select>

实际结果：

<select datatag="data-States=''" class="form-control filter-select" data-multi-select="" id="States" multiple="multiple" name="States">
<optgroup label="MA">
<option value="01602">01602</option>
</optgroup>
<optgroup label="MA">
<option value="02743">02743</option>
</optgroup>
<optgroup label="MA">
<option value="01107">01107</option>
</optgroup>
</select>

方法：

 public ManifestFilterDropDownItem ReturnManifestFilterDataBasedOnTotalDataSet(IEnumerable<ManifestTableItem> data, bool isUserASR) {
            IEnumerable<SelectListGroup> stateGroups = data.Select(x => x.AddrState.ToUpper()).Distinct().Select(x => new SelectListGroup() {
                Name = …