Datetime.utc返回1-1-0001 00:00:00在事件查看器

Question

我想當前的日期返回到我的事件記錄器，我已經試過這樣：

public class LogDate 
{ 
    protected DateTime localDate { get; set; } 

    public LogDate() 
    { 
     localDate = DateTime.Now; 

    } 
} 

。

public class Eventlog : LogDate 
{ 
    public void logEvent(string answer) 
    { 

     this.localDate = new DateTime(); 


     try 
     { 
      string sSource; 
      string sLog; 
      string sEvent; 

      sSource = "dotNET Sample App"; 
      sLog = "filmdatabase"; 
      sEvent = this.localDate + answer; 

不知何故，當我嘗試這個，它返回1-1-0001 00:00:00。而不是實際的時間。

Answer 1

您指定this.localDate又一個新DateTime：

this.localDate = new DateTime(); 

1-1-0001 00:00:00是new DateTime()默認值。要修復它，請使用this.localDate，而不要將其重新分配爲new DateTime()。

public class Eventlog : LogDate 
{ 
    public void logEvent(string answer) 
    { 

     //this.localDate = new DateTime(); //remove this  

     try 
     { 
      string sSource; 
      string sLog; 
      string sEvent; 

      sSource = "dotNET Sample App"; 
      sLog = "filmdatabase"; 
      sEvent = this.localDate.ToString() + " " + answer; //use it directly as you have initialized that in your constructor 

直接使用它作爲你一直在構造函數初始化它：

public class LogDate 
{ 
    protected DateTime localDate { get; set; } 

    public LogDate() 
    { 
     localDate = DateTime.Now; 

    } 
} 

Answer 2

您設置localDate新的默認值

this.localDate = new DateTime();