所以我理解如何制作全局值以及1.你不应该这样做的事实2.你不能使用在不同的“上下文”中创建的值但是，我不知道如何纠正在我的情况下这个问题。我认为如果你阅读我的代码会有意义
//read in Load Query TestCSV
var sourcePath = @"D:\\Load Query test.csv"; //What is the inital CSV
var delimiter = ",";
var firstLineContainsHeaders = true; //CSV has headers
//creates temp file which takes less time than loading into memory
var tempPath = Path.Combine(@"D:", Path.GetRandomFileName());
var lineNumber = 0;
var splitExpression = new Regex(@"(" + delimiter + @")(?=(?:[^""]|""[^""]*"")*$)");
using (var writer = new StreamWriter(tempPath))
using (var reader = new StreamReader(sourcePath))
{
string line = null;
string[] headers = null;
if (firstLineContainsHeaders)
{
line = reader.ReadLine();
lineNumber++;
if (string.IsNullOrEmpty(line)) return; // file is empty;
headers = splitExpression.Split(line).Where(s => s != delimiter).ToArray();
writer.WriteLine(line); // write the original header to the temp file.
}
var i = 0; //used in 2nd while loop later
string lines = null;//used in next using statement
while ((line = reader.ReadLine()) != null)
{
lineNumber++;
var columns = splitExpression.Split(line).Where(s => s != delimiter).ToArray();
//make sure you always have the same number of columns in a line
if (headers == null) headers = new string[columns.Length];
if (columns.Length != headers.Length) throw new InvalidOperationException(string.Format("Line {0} is missing one or more columns.", lineNumber));
string badDate = "Date entered incorrectly"; //used in next while loop
// this while loop will read in the user input dateTime and use that to get the column from the PI server.
//if the date time is entered incorrectly it will tell the user to try to input the datetime again
while (i==0)
{
Console.WriteLine("Enter date, ex:16 Jun 8:30 AM 2008, Press enter when done"); //instruct the user in how to enter the date
string userInput = Console.ReadLine(); //read in the date the user enters
string format = "dd MMM h:mm tt yyyy"; //how the system will read the date entered
DateTime dateTime;
//if date is entered correctly, parse it, grab the parsed value dateTime and exit loop
if (DateTime.TryParseExact(userInput, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime))
{
i = 1; //set the flag to exit while loop
}
//if input is bad return "Date entered incorrectly and run the loop again
else
{
Console.WriteLine(badDate);
i=0; //set the flag to run the loop again
}
}
var del = ","; //used in next using statement
var SplitExpression = new Regex(@"(" + del + @")(?=(?:[^""]|""[^""]*"")*$)"); //used in next using statement
//Use the dateTime from the previous while loop and use it to add each point in "testpts.csv" to "Load Query Test.csv"
using (StreamReader tags = new StreamReader(@"D:\\testpts.csv"))
{
// string userInput = Console.ReadLine();
string format = "dd MMM h:mm tt yyyy";
DateTime.TryParseExact(userInput, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime);
lines = tags.ReadLine();
var columns1 = SplitExpression.Split(lines).Where(s => s != del).ToArray();
var point = PIPoint.FindPIPoint(piServer, lines);
var value = point.RecordedValue(dateTime);
string returnXml = string.Format(@"<value=""{0}"" />", value);
columns[15] = columns[15].Replace("0", returnXml); //column the point should be placed in (in Load Query Test.csv)
}
//if statement that will replace any extra 0 testpt values with column 13 values
if (columns[15].Contains("0"))
{
columns[15] = columns[15].Replace("0", columns[13]);
}
writer.WriteLine(string.Join(delimiter, columns));
}
}
File.Delete(sourcePath); //delete the original csv
File.Move(tempPath, sourcePath); //replace the old csv with edited one
Console.ReadLine();
我在using语句中遇到错误：
using (StreamReader tags = new StreamReader(@"D:\\testpts.csv"))
{
// string userInput = Console.ReadLine();
string format = "dd MMM h:mm tt yyyy";
DateTime.TryParseExact(userInput, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTime);
lines = tags.ReadLine();
var columns1 = SplitExpression.Split(lines).Where(s => s != del).ToArray();
var point = PIPoint.FindPIPoint(piServer, lines);
var value = point.RecordedValue(dateTime);
string returnXml = string.Format(@"<value=""{0}"" />", value);
columns[15] = columns[15].Replace("0", returnXml); //column the point should be placed in (in Load Query Test.csv)
}
在这种情况下，dateTime和userInput值显然不在上下文中。我需要在之前的while循环中创建它们，但是因为我希望用户能够只输入一次正确的日期并确保正确输入它以确保脚本实际上会提取数据。
请告诉我是否有其他方式可以订购我的代码或如何使userInput和dateTime全局。谢谢
答案 0 :(得分：1)
您的问题出在“ dateTime ”变量中。 “ userInput ”没问题，内部using语句可以访问其外部using语句的范围，因为内部语句是外部范围的一部分。
问题在于“ dateTime ” - 变量在while循环中声明，之后有一个使用块 - 变量不再可用后，因为范围被处理 - 它引用了一个不存在的变量。
解决方案：移出dateTime变量的声明。比如，在while定义之前的一行。
答案 1 :(得分：0)
没有批评你的代码......这里有一个答案。你应该能够从这里走出来
使用赋值
拆分变量的声明yourLyncClientInstance.ConversationManager.JoinConference(exchangeUrl);
到
string userInput = Console.ReadLine();
将声明（第一行）移到外部循环之外。
编辑：请同时查看Properties（您可以打电话给他们 全局）