如何將字符串類型轉換爲任務型

Question

我有它由特定任務xml節點的字符串，項目列表的字符串，我通過這兩項任務和項目列表進行迭代，並調用另一個功能並通過任務和項目列表，但它給了我一個錯誤best overloaded method and it has some invalid argument。我假設它是一個類型轉換錯誤。

這裏是我的代碼：

private void addtask(object sender,RoutedEventArgs e) 
    { 
     foreach (object item in tasklistBox.Items) 
     { 
      var listBoxItem = tasklistBox.ItemContainerGenerator.ContainerFromItem(item); 
      var myContentPresenter = FindVisualChild<ContentPresenter>(listBoxItem); 
      var myDataTemplate = myContentPresenter.ContentTemplate; 
      var mydata = (System.Windows.Controls.Label)myDataTemplate.FindName("tasklabel", myContentPresenter); 
      var xmlElement = (XmlElement)mydata.Content; 
      //System.Windows.Forms.MessageBox.Show(xmlElement.InnerText); 

      foreach (Harvest_Project item1 in Globals._globalController.harvestManager._PROJECTLIST) 
      { 
       Globals._globalController.harvestManager.assignTaskToProject(xmlElement.InnerText,item1); 
      } 
     } 
    } 

和另一類我打電話的功能：

public void assignTaskToProject(Harvest_Task task, Harvest_Project project) 
    { 
     Console.WriteLine("Assigning Task to Project"); 

     string assignXML = "<task>" + 
           "<id type=\"integer\">" + task._id + "</id> " + 
          "</task>"; 

     sendPOSTRequest(uri + _GETALLPROJECTS + "/" + project._id + "/task_assignments", assignXML); 

    } 

的Harvest_Task類是在這裏：

private bool _billable_by_default; 

    private bool _deactivated; 

    private float _default_hourly_rate=0; 

    public int _id { get; set; } 

    private bool _is_default; 

    public string _name { get; set; } 

    private DateTime _created_at; 

    private DateTime _updated_at; 

    private XmlNode _node; 

    public Harvest_Task() 
    { } 

    public Harvest_Task(XmlNode node) 
    { 

     this._node = node; 
     this._name = node.SelectSingleNode("name").InnerText; 


     this._created_at = Harvest_Base.storeTime(node.SelectSingleNode("created-at").InnerText); 
     this._updated_at = Harvest_Base.storeTime(node.SelectSingleNode("updated-at").InnerText); 

     this._is_default = bool.Parse(node.SelectSingleNode("is-default").InnerText); 
     this._deactivated = bool.Parse(node.SelectSingleNode("deactivated").InnerText); 

     float.TryParse(node.SelectSingleNode("default-hourly-rate").InnerText,out this._default_hourly_rate); 
     this._id = int.Parse(node.SelectSingleNode("id").InnerText); 


    } 

    public Harvest_Task(string name, float defaultHourlyRate) 
    { 
     this._name = name; 
     this._default_hourly_rate = defaultHourlyRate; 
    } 

    public string createXMLAddEntry() 
    { 
     string returnXML = "<task>" + 
           "<billable-by-default type=\"boolean\">true</billable-by-default>" + 
           "<default-hourly-rate type=\"decimal\">"+this._default_hourly_rate+"</default-hourly-rate>" + 
           "<is-default type=\"boolean\">true</is-default>" + 
           "<name>" + this._name + "</name> " + 
          "</task>"; 


     return returnXML; 
    } 

的Harvest_Project類在這裏

public string _name { get; set; } 

    private DateTime _over_budget_notified_at; 

    private bool _billable; 

    private DateTime _created_at; 

    private bool _active; 

    private enum _bill_by { Tasks, People, none }; 

    public int _client_id = 0; 

    private string _code; 

    private string _notes; 

    private enum _budget_by { project, project_cost, task, person, none }; 

    private float _budget = 0; //Budget in hrs 

    private DateTime _latest_record_at; 

    private DateTime _earliest_record_at; 

    private int _fees = 0; 

    public int _id { get; set; } 

    private DateTime _updated_at; 

    private XmlNode _node; 

    public int getId() { return this._id; } 

    public Harvest_Project(XmlNode node) 
    { 
     this._node = node; 
     this._name = node.SelectSingleNode("name").InnerText; 

     this._created_at = storeTime(node.SelectSingleNode("created-at").InnerText); 
     this._updated_at = storeTime(node.SelectSingleNode("updated-at").InnerText); 
     this._over_budget_notified_at = storeTime(node.SelectSingleNode("over-budget-notified-at").InnerText); 
     this._latest_record_at = storeTime(node.SelectSingleNode("hint-latest-record-at").InnerText); 
     this._earliest_record_at = storeTime(node.SelectSingleNode("hint-earliest-record-at").InnerText); 

     this._billable = bool.Parse(node.SelectSingleNode("billable").InnerText); 

     try 
     { 
      this._id = Convert.ToInt32(getXmlNode("id", node)); 
      this._client_id = Convert.ToInt32(getXmlNode("client-id", node)); 
      this._budget = float.Parse(getXmlNode("budget", node)); 
      this._fees = Convert.ToInt32(getXmlNode("fees", node)); 

     } 
     catch (OverflowException e) 
     { 
      Console.WriteLine("The number cannot fit in an Int32."); 
     } 
     catch (FormatException e) 
     { 
      Console.WriteLine("The string is not a valid integer"); 
     } 

     this._code = node.SelectSingleNode("code").InnerText; 
     this._notes = node.SelectSingleNode("notes").InnerText; 


    } 

此功能有Harvest_task和Harvest_Project類，我打電話這個功能，但無法呼叫。此行給出錯誤

Globals._globalController.harvestManager.assignTaskToProject(xmlElement.InnerText,item1); 要使用哪種轉換？我堅持

任何幫助嗎？謝謝

Answer 1

因此，從我所看到的，你可以使用這個

foreach (Harvest_Project item1 in Globals._globalController.harvestManager._PROJECTLIST) 
{ 
    Globals._globalController.harvestManager.assignTaskToProject(new Harvest_Task(xmlElement), item1); 
} 

我使用的構造public Harvest_Task(XmlNode node)從Harvest_Task創建一個實例，而不是xmlElement.InnerText作爲參數傳遞給assignTaskToProject方法遠遠

我懷疑它不能太爲你的XML沒有任何身份證件和構造預期node.SelectSingleNode("id").InnerText

Answer 2

你需要解析InnerText屬性來創建Harvest_Task類型 - InnerText將是字符串類型，所以它可能是一個計劃添加一個'轉換器'類，它接受字符串類型並輸出一個Harvest_Task對象。

class HarvestTaskConverter { 
    public Harvest_Task Convert(string text) { 
     var task = new Harvest_Task(); 
     // parse the text here 
     return task; 
    } 
} 

只是一對夫婦的補充意見 - 方法/變量的命名不是很C＃ - 駝峯是首選，而「全球」變量時一般不贊成，但一切都取決於你是否擁有控制權的其他碼。