用於導航的按鈕編寫代碼禁用後不工作按鈕

-1

我有一個視圖模型，其中包含驗證代碼，並且還有一些驗證失敗時用於禁用按鈕的代碼..我有窗口包含員工信息的字段，該窗口包含保存按鈕和一個按鈕導航到另一個窗口..但該按鈕不起作用後，我編寫代碼禁用按鈕..我已經綁定了'isenabled'屬性的一些屬性，用於禁用按鈕..我沒有結合用於navigation.why它不工作？按鈕..幫我urgently..am使用MVVM用於導航的按鈕編寫代碼禁用後不工作按鈕

這是我失效按鈕

public EmployeeViewModel() 
     { 
this.validProperties = new Dictionary<string, bool>(); 
      this.validProperties.Add("FirstName", false); 
      this.validProperties.Add("LastName", false); 
      this.validProperties.Add("Street1", false); 
      this.validProperties.Add("Street2", false); 
      this.validProperties.Add("City", false); 
      this.validProperties.Add("State", false); 
      this.validProperties.Add("ZipCode", false); 
      this.validProperties.Add("PhoneNumber", false); 
      this.validProperties.Add("MobileNumber", false); 
      this.validProperties.Add("Email", false); 
      this.validProperties.Add("Web", false);  
    } 

public bool AllPropertiesValid 
     { 
      get { return allPropertiesValid; } 
      set 
      { 
       if (allPropertiesValid != value) 
       { 
        allPropertiesValid = value; 
        OnPropertyChanged("AllPropertiesValid"); 
       } 
      } 
     } 

private void ValidateProperties() 
     { 
      foreach (bool isValid in validProperties.Values) 
      { 
       if (!isValid) 
       { 
        this.AllPropertiesValid = false; 
        return; 
       } 
      } 
      this.AllPropertiesValid = true; 
     } 

public string Error 
     { 
      get { throw new NotImplementedException(); } 
     } 

     public string this[string propertyName] 
     { 
      get 
      { 
       string strMessage = string.Empty; 
       validateUserInput(ref strMessage, propertyName); 
       validProperties[propertyName] = String.IsNullOrEmpty(strMessage) ? true : false; 
       ValidateProperties(); 
       CommandManager.InvalidateRequerySuggested(); 
       return strMessage; 
      } 
     } 

     private string validateUserInput(ref string pstrMessage, string pstrpropertyName) 
     { 
      switch (pstrpropertyName) 
      { 
       case "FirstName": 
        if (string.IsNullOrEmpty(FirstName)) 
         pstrMessage = "FirstName is required."; 
        else if (string.IsNullOrWhiteSpace(FirstName)) 
         pstrMessage = "Spaces are not allowed in First name. only character are allowed"; 
        break; 
       case "LastName": 
        if (string.IsNullOrEmpty(LastName)) 
         pstrMessage = "LastName is required."; 
        break; 
       case "Street1": 
        if (string.IsNullOrEmpty(Street1)) 
         pstrMessage = "Street1 is required"; 
        break; 
       case "Street2": 
        if (string.IsNullOrEmpty(Street2)) 
         pstrMessage = "Street2 is required"; 
        break; 
       case "City": 
        if (string.IsNullOrEmpty(City)) 
         pstrMessage = "City is required"; 
        break; 
       case "State": 
        if (string.IsNullOrEmpty(State)) 
         pstrMessage = "State is required"; 
        break; 
       case "ZipCode": 
        if (string.IsNullOrEmpty(ZipCode)) 
         pstrMessage = "ZipCode is required"; 
        else if (Regex.IsMatch(employee.ZipCode, AppConstants.Regexpatterns.ZiCodeRegex) == false) 
         pstrMessage = "Only 6 digits are allowed in ZipCode field."; 
        break; 
       case "PhoneNumber": 
        if (string.IsNullOrEmpty(PhoneNumber)) 
         pstrMessage = "PhoneNumber is required"; 
        else if (Regex.IsMatch(employee.PhoneNumber, AppConstants.Regexpatterns.PhoneNumberRegex) == false) 
         pstrMessage = "Enter a valid PhoneNumber."; 
        break; 
       case "MobileNumber": 
        if (string.IsNullOrEmpty(MobileNumber)) 
         pstrMessage = "MoblieNumber is required"; 
        else if (Regex.IsMatch(employee.MobileNumber, AppConstants.Regexpatterns.PhoneNumberRegex) == false) 
         pstrMessage = "Enter a valid MobileNumber."; 
        break; 
       case "Email": 
        if (!(string.IsNullOrEmpty(Email))) 
         if (Regex.IsMatch(Email, AppConstants.Regexpatterns.EmailRegex) == false) 
          pstrMessage = "Enter a valid EmailID."; 
        break; 
       case "Web": 
        if (!(string.IsNullOrEmpty(Web))) 
         if (Regex.IsMatch(Web, AppConstants.Regexpatterns.WebRegex) == false) 
          pstrMessage = "Enter a valid Web Address."; 
        break; 
      } 
      return pstrMessage; 
     }

012碼

這是我保存按鈕

<Button Grid.Row="11" Grid.Column="3" Width="47" Name="btnAdd" Content="ADD" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,6,0,0" Height="22" Background="Black" Foreground="White" Command="{Binding SaveEmployeeCommand}" IsEnabled="{Binding Path=AllPropertiesValid}"></Button> 

this is my xaml for navigate button 

<Button Content="Home" Name="btnHome" Margin="440,0,-4,465" Command="{Binding HomeCommand}" Background="#FF2693A7" Foreground="White" />

來源

2013-09-24 user2786086

你使用的是什麼類型的命令和MVVM框架？命令的某些實現（例如MvvmLight中的DelegateCommand）提供了「可執行」邏輯，您可以使用它來禁用按鈕。此外，您可能需要考慮使用數據註釋或業務對象/規則框架，這使得此驗證在您身上更容易。也就是說，在這種情況下它不能很好地工作，因爲你的OnPropertyChanged看起來不錯。（注意：你可以在.NET 4.5中的OnPropertyChanged參數上使用屬性[CallerMemberName]來避免魔法字符串。） – Guttsy

你在HomeCommand（） –

如果你說你<Button Content="Home" />按鈕是無效的XAML中，我看到的唯一原因是你已經綁定命令到它，如果是Command has CanExecute然後從CanExecute返回false禁用按鈕。

來源

2013-09-24 05:22:19 Nitin

中有什麼你可以執行的按鈕hasnt – user2786086

用於導航的按鈕編寫代碼禁用後不工作按鈕

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