程序未写入文件，但会在C＃中写入控制台

Question

I have a C# program and it will not write to a file but does write to console, even though the file write line is before console. i have tried several modifications and run through debug as well, and it never writes to the file or it puts one line in the file only

// 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

Most anything that writes out to a file should be either within a using block or manually fushed and closed.

using (var writer = ...)
{

    // Do your writing

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

Note: I'm not a huge fan of var but as I don't know what class you're using it at least makes a valid example of code

Answer 2

您没有提供用于文件访问的代码，但是99％的用户确保未关闭流。

Answer 3

如果要在关闭编写器之前强制输出，请调用Flush()