使用 StreamWriter 写入文本文件时出现 C# OutOfMemoryException

Question

我查看了与此问题类似的答案，但我认为我仍然不明白为什么会出现异常。

根据堆栈跟踪，我正在尝试调试在写入文本文件时抛出“OutOfMemoryException”的一段代码。从以下行抛出异常:

WriteToLogFile("Found in EnumerateActiveDirectoryFilteredMembers: " + e.Message);

WriteToLogFile方法如下:

    static void WriteToLogFile(string strLine)
    {
        using (StreamWriter sw = new StreamWriter(strLogFileName, true))
        {
            sw.WriteLine("[" + DateTime.Now.ToString() + "]: " + strLine);
        }
    }

看起来 StreamWriter 对象有时会抛出这个异常，但不是每次调用该方法时都会在该方法的末尾重新分配内存吗？并且使用“using”关键字不是确保该对象被丢弃吗？

当抛出异常时，该文件只有 13 KB - 那么这里到底发生了什么？

更新:OutOfMemoryException 不是 WriteToLogFile 方法。它被抛出得更早，但我不知道这是从哪里来的……我将在 catch 之前添加一个 try 语句的框架:

        try
        {
            if (objSearchResults.Count != 0)
            {
                // ADD TO DATASET HERE //
                string tableName = "tempADhold";
                DataSet domains = new DataSet();
                domains.Tables.Add(tableName);

                //add x number of columns
                domains.Tables[tableName].Columns.Add("DomainID", typeof(string));
                .
                .
                .

                // Get the object from AD.
                foreach (SearchResult objResultUser in objSearchResults)
                {
                    // Init variables and init formatting of strings for adding objects
                    string DomainID = ""; string UserName = ""; string Title = "";
                    .
                    .
                    .

                    objUserEntry = objResultUser.GetDirectoryEntry();
                    // Populate obj and LDAP path variables.  
                    // Perform edits before setting variables. 
                    //   Match strings to SQL Server table sizes.

                    // add objects in same manner:
                    // DomainID
                    if (objUserEntry.Properties["samAccountName"].Count > 0)
                    {
                        DomainID = objUserEntry.Properties["samAccountName"].Value.ToString();
                        if (DomainID.Substring(0, 1).ToUpper() != "N")
                        {
                            WriteToLogFile("RECORD SKIPPED: Invalid N_Number: " + DomainID);
                            continue;  //skip this record
                        }
                        else if (DomainID.Length > 8)
                        {
                            WriteToLogFile("RECORD SKIPPED: Invalid N_Number length. #s ending in 'c' should be skipped: " + DomainID);
                            continue;  //skip this record
                        }

                    }
                    .
                    .
                    .

                    //set up array struct for adding obj

                    ADUserList[0] = DomainID; ADUserList[1] = UserName;
                    ADUserList[2] = ...; ADUserList[3] = ...;
                    ADUserList[4] = ...; ADUserList[5] = ...;
                    ADUserList[6] = ...; ADUserList[7] = ...;
                    ADUserList[8] = ...; ADUserList[9] = ...;
                    ADUserList[10] = ...; ADUserList[11] = ...;
                    ADUserList[12] = ...; ADUserList[13] = ...;
                    ADUserList[14] = ...; ADUserList[15] = ...;
                    ADUserList[16] = ...;

                    if (ADUsersIndex > 0 && ADUsersIndex % 2500 == 0)
                    {
                        //Add to dataset instead of array here...
                        if (InsertRows(domains.Tables[tableName]).Equals(false)) { return false; }
                        domains.Tables[tableName].Rows.Clear();
                    }

                    DataRow myRow = domains.Tables[tableName].NewRow();
                    myRow.ItemArray = ADUserList;
                    domains.Tables[tableName].Rows.Add(myRow);
                    ADUsersIndex++;

                }
                //Write the last rows to the database.
                if (InsertRows(domains.Tables[tableName]).Equals(false)) { return false; }
                objSearchResults.Dispose();


            } //end "if (objSearchResults.Count != 0)"

            else
            {
                WriteToLogFile("Results: No Active Directory filtered members found.");
            }
        }
        catch (Exception e)
        {
           if (e is OutOfMemoryException) throw;
           WriteToConsole("Error in EnumerateActiveDirectoryFilteredMembers: " + e.Message);
           return true;
        }

Answer 1

正在尝试运行时抛出此消息

WriteToLogFile("Found in EnumerateActiveDirectoryFilteredMembers: " + e.Message);

在错误处理程序中

e 几乎可以肯定已经是一个 OutOfMemory 异常，但是您的处理程序在尝试记录消息时抛出，“隐藏”了真正的堆栈跟踪。

在 WriteToLogFile 行之前将其添加到您的错误处理程序中:

if (e is OutOfMemoryException) throw;

这仍然会导致应用程序停止运行，但会为您提供原始错误的真实 StackTrace。