如果在c#中未正确检查其他条件？

我遇到了一个问题，我正在检查一些元素键值是否有效，以便继续二维码扫描。例如：如果“我的活动”属性为true，而“完成”属性为false，并且计划时间为当前时间+-30分钟的开始窗口，则继续扫描。如果没有，让我给他们看一个错误。我尝试用一个简单的if实现检查部分，但只检查活动的和完成的键值。有谁能帮我解决这个问题吗。谢谢你的帮助

这是我的密码：

     public void ScanQrCode()
     {

         BarcodeScanner.Scan(async (barCodeType, barCodeValue) =>
         {
             BarcodeScanner.Stop();


             var results = JsonConvert.DeserializeObject<dynamic>(barCodeValue);
             var gettingTheName = (string) results.Evaluation.Value;
             TextHeader.text = gettingTheName;
             var qrCodeString = $"***************.firebaseio.com/Evaluations/.json?orderBy=\"$key\"&startAt=\"{gettingTheName}\"&limitToFirst=1";
             Debug.Log(barCodeValue);

                           var qrCodeObj = JsonConvert.DeserializeObject<dynamic>(qrCodeString);


                       try
              {

                   bool parseSuccessful = DateTime.TryParse("ScheduleStartTime", out var scheduledStartTime);
                  if (results.Contains("Active").Equals(true) &&
                      results.Contains("Completed").Equals(false) &&
                      DateTime.Now < scheduledStartTime.AddMinutes(30) &&
                      DateTime.Now > scheduledStartTime.AddMinutes(-30)) {

                      var matchingLink = new WebClient().DownloadString(qrCodeString);
                      var obj = Newtonsoft.Json.JsonConvert.DeserializeObject<JObject>(matchingLink);
                      var candidateId = obj.First.First["CandiateID"].ToString();
                      string page = $"https://***********.firebaseio.com/Candidates/.json?orderBy=\"$key\"&startAt=\"{candidateId}\"&limitToFirst=1";

                      using (HttpClient client = new HttpClient())
                      using (HttpResponseMessage response = await client.GetAsync(page))
                      using (HttpContent content = response.Content)
                      {
                          // Reading the string. 
                          Dictionary<string, Candidates> evaluationDictionary = new Dictionary<string, Candidates>();
                          string result = await content.ReadAsStringAsync();
                          evaluationDictionary = JsonConvert.DeserializeObject<Dictionary<string, Candidates>>(result);
                          Debug.Log(evaluationDictionary);

                          foreach (Candidates candidates in evaluationDictionary.Values)
                          {
                              string evaluationMessage = candidates.FirstName + " " + candidates.LastName;
                              candidateMessage = GetComponent<Text>();
                              candidateMessage.text = evaluationMessage;

                          }


                          // Getting a reference to the text component.
                          candidateMessage = GetComponent<Text>();
                          candidateMessage.text = matchingLink.ToString();
                          candidateMessage.text = matchingLink.Trim(new char[] {'"'});

                      }

                  }
                  else
                  {
                      EditorUtility.DisplayDialog("Incorrect credentials", "Please scan a valid QR code", "OK");
                  }
              }
              catch (Exception e)
              {
                  Console.WriteLine(e);
                  SceneManager.LoadScene("Verify");
                  throw;
              }
          });
      }
  }

---

嗯。我也被困在那一部分。我试着通过添加 &&qrCodeString.Contains（“ScheduleStartTime”）.Equals（我被卡住了 这里）

我将通过将日期字符串解析为DateTime对象来完成这一部分，然后将当前时间与在两个方向上移动的新DateTime进行比较

我可能会这样做：

try {
                bool parseSuccessful = DateTime.TryParse( ScheduledStartTimeFromJSON, out var scheduledStartTime );
                if ( qrCodeString.Contains( "Active" ).Equals( true ) &&
                     qrCodeString.Contains( "CompletedMessage" ).Equals( false ) &&
                     DateTime.Now < scheduledStartTime.AddMinutes(30) && 
                     DateTime.Now > scheduledStartTime.AddMinutes( -30 ) ) {
                    var matchingLink = new WebClient().DownloadString( qrCodeString );
                    ...
                }
            }

试试看{
bool parseSuccessful=DateTime.TryParse（ScheduledStartTimeFromJSON，out变量scheduledStartTime）；
if（qrCodeString.Contains（“Active”）.Equals（true）&&
qrCodeString.Contains（“CompletedMessage”）.Equals（false）&&
DateTime.NowscheduledStartTime.AddMinutes（-30））{
var matchingLink=new WebClient（）.DownloadString（qrCodeString）；
...
}
}

---

在将日期与任何内容进行比较之前，还应检查以确保已成功解析日期

根据您的JSON示例：

• 首先，我认为您应该检查Completed值，而不是CompletedMessage
• 使用此代码搜索

  qrCodeString.Contains（“Active”）.Equals（true）

  您只是检查字符串中是否包含Active。我认为你应该寻找它的价值

在我看来，正确的检查方法是首先像这样反序列化JSON

var qrCodeObj = JsonConvert.DeserializeObject<dynamic>(qrCodeString);

var qrCodeObj=JsonConvert.DeserializeObject（qrCodeString）；

然后检查相应的值

if (qrCodeObj["Active"] == true && qrCodeObj["Completed"] == false)
{
   var matchingLink = new WebClient().DownloadString(qrCodeString);
   var obj = Newtonsoft.Json.JsonConvert.DeserializeObject<JObject (matchingLink);
   var candidateId = obj.First.First["CandiateID"].ToString();
   string page = $"https://*********.firebaseio.com/Candidates/.json?orderBy=\"$key\"&startAt=\"{candidateId}\"&limitToFirst=1";

   using (HttpClient client = new HttpClient())
   using (HttpResponseMessage response = await client.GetAsync(page))
   using (HttpContent content = response.Content)
   {
     // Reading the string. 
     Dictionary<string, Candidates> evaluationDictionary = new Dictionary<string, Candidates>();
     string result = await content.ReadAsStringAsync();
     evaluationDictionary = JsonConvert.DeserializeObject<Dictionary<string, Candidates>>(result);
     Debug.Log(evaluationDictionary);

     foreach (Candidates candidates in evaluationDictionary.Values)
       {
        string evaluationMessage = candidates.FirstName + " " + candidates.LastName;
        candidateMessage = GetComponent<Text>();
        candidateMessage.text = evaluationMessage;

       }


       // Getting a reference to the text component.
       candidateMessage = GetComponent<Text>();
       candidateMessage.text = matchingLink.ToString();
       candidateMessage.text = matchingLink.Trim(new char[] {'"'});


     }
}
else
{
   EditorUtility.DisplayDialog("Incorrect Credentials ",
                 "Please scan a valid QR code. " , "OK");
}

if（qrCodeObj[“活动”]==true&&qrCodeObj[“完成”]==false）
{
var matchingLink=new WebClient（）.DownloadString（qrCodeString）；
var obj=Newtonsoft.Json.JsonConvert.DeserializeObjectI在计划时间内看不到任何验证。是的。我也有点困在这一部分。我尝试通过添加
&&qrCodeString.Contains（“ScheduleStartTime”）.Equals（*我困在这里*）
另外，我的其余字段的验证是否足够好？但是，如果让我们说如果活动字段为false，而完成字段为true，我不想将它们带到验证窗口scene@Crowcoder我更新了我的代码。现在，即使满足键值，它也只会触发
else cause
。请避免，我的else if validation正确吗，还有我的catch子句？我首先这样做了
bool parseSuccessful=DateTime.TryParse（“ScheduleStartTime”，out var scheduledStartTime）；
但是，我扫描了我的二维码，但它不会触发else if或catch cause？ScheduledStartTimeFromJSON应该是用于访问日期字符串的变量或函数。否则，您的验证看起来是正确的。在catch块中，我建议将e.StackTrace写入控制台或在块中的任何位置添加断点帮助您调试。我不知道SceneManager是什么，我认为您重新抛出的原因是因为您有其他更高级别的错误处理。SceneManager是我加载下一个场景的地方。另外，如何使更高级别的错误处理正常工作？如果在数据库中，我将active更改为false，并将completed更改为true显示我的else原因。您应该在if语句之前设置一个断点，并检查正在比较的变量，以验证它们是否符合预期。只有在其各自的try块中发生错误时，才会执行catch块。应用程序中有数百个教程可处理异常。TutorialsPoint是一个可以启动的位置。Com这段对话不适用于长时间的讨论；这段对话已经结束。
if (qrCodeObj["Active"] == true && qrCodeObj["Completed"] == false)
{
   var matchingLink = new WebClient().DownloadString(qrCodeString);
   var obj = Newtonsoft.Json.JsonConvert.DeserializeObject<JObject (matchingLink);
   var candidateId = obj.First.First["CandiateID"].ToString();
   string page = $"https://*********.firebaseio.com/Candidates/.json?orderBy=\"$key\"&startAt=\"{candidateId}\"&limitToFirst=1";

   using (HttpClient client = new HttpClient())
   using (HttpResponseMessage response = await client.GetAsync(page))
   using (HttpContent content = response.Content)
   {
     // Reading the string. 
     Dictionary<string, Candidates> evaluationDictionary = new Dictionary<string, Candidates>();
     string result = await content.ReadAsStringAsync();
     evaluationDictionary = JsonConvert.DeserializeObject<Dictionary<string, Candidates>>(result);
     Debug.Log(evaluationDictionary);

     foreach (Candidates candidates in evaluationDictionary.Values)
       {
        string evaluationMessage = candidates.FirstName + " " + candidates.LastName;
        candidateMessage = GetComponent<Text>();
        candidateMessage.text = evaluationMessage;

       }


       // Getting a reference to the text component.
       candidateMessage = GetComponent<Text>();
       candidateMessage.text = matchingLink.ToString();
       candidateMessage.text = matchingLink.Trim(new char[] {'"'});


     }
}
else
{
   EditorUtility.DisplayDialog("Incorrect Credentials ",
                 "Please scan a valid QR code. " , "OK");
}