程序未寫入文件，但會在C＃中寫入控制台

Question

我有一個C＃程序，它將不會寫入文件，但會寫入控制台，即使文件寫入行位於控制台之前。 我已經嘗試了幾次修改並通過調試運行，並且它從不寫入文件或僅在文件中放置一行

// Read the file and display it line by line. 
System.IO.StreamReader file = new System.IO.StreamReader("urltest.txt"); 
string myFileName = String.Format("{0}_{1}", DateTime.Now.ToString("yyyyMMddhh"), "-urlcheck.log"); 
while((line = file.ReadLine()) != null) 
{
Uri myUri = new Uri(line); 
using (StreamWriter writer = new StreamWriter(myFileName)) 
try
{
// create the web request and response based on the url that has been 
// just read from the file urltest.txt
HttpWebRequest reqFP = (HttpWebRequest)HttpWebRequest.Create(myUri);
HttpWebResponse rspFP = (HttpWebResponse)reqFP.GetResponse();
if (HttpStatusCode.OK == rspFP.StatusCode)
{
// HTTP = 200 - Internet connection available, server online
// Write status of the URL to the log file
writer.WriteLine("=================================================================     =========");
writer.WriteLine("Status code of returned: OK  " + myUri + "  THIS URL IS NOT     BLOCKED!");
Console.WriteLine("Status code of returned: OK  " + myUri + "  THIS URL IS NOT BLOCKED!");
var _uri = myUri.ToString();
string _catstr1 = catURL(_uri);
//regex to get the last 8-9 items of the line and replace them
Regex pat = new Regex(@"</(.*?)a");
string _catstr = pat.Replace(_catstr1, "\x20");
// Write the Catagory of the URL to file and continue
writer.WriteLine("URL " + _catstr);
Console.WriteLine("URL " + _catstr);
}
}

Answer 1

大部分寫入文件的內容都應該在using塊內，或者手動填充並關閉。

using (var writer = ...)
{

    // Do your writing

} // <- upon leaving the using block writer will automatically be cleaned up.

注意：我不是var忠實var但由於我不知道您使用的是什么類，至少可以作為一個有效的代碼示例

Answer 2

您沒有提供用於文件訪問的代碼，但是99％的用戶確保未關閉流。

Answer 3

如果要在關閉編寫器之前強制輸出，請調用Flush()