我们如何使用类类型来管理硬编码字符串等不同变量。 [英] How we are using class type to manage different variables like hard coded strings.

问题描述

我们如何使用类类型来管理不同的变量，如硬编码字符串。

How we are using class type to manage different variables like hard coded strings.

推荐答案

我之前没有发帖，因为我没有太多的你有什么问题。



如果你有一个多次使用的字符串，那么我可能会建议使用私有const字符串，但它不会经常发生在你的代码中。每个字符串都被编译和使用，就像一个常量，所以没有任何东西可以获得。你的应用程序可能在磁盘上占用额外的4位：S



我看起来非常庞大且复杂的xml解析器有超过50个字段。字段名称字符串主要用于可读性。这似乎也不适用于此。





我建议添加一些错误处理。不是Try-Catch，而是正确处理可能的错误：

I didn't post earlier because I don't have much of an issue with what you have.

If you had a string that was used many times, then I might suggest using a private const string, but it doesn't happen often in your code. Each string is compiled and used just like a constant so there is nothing to be gained. Your app might take up an extra 4 bits on disk :S

I have seem very large and complex xml parsers with over 50 fields. Field name strings were used mostly for readability. That doesn't appear to apply here either.


I would suggest adding some error handling. Not Try-Catch but properly handling a possible error:

private int PopulateTree(TreeNodeCollection ParentNodes, string ParentText)
{

    string fileName = @"ProductDependency.xml";
    XDocument xdoc;

    if(!File.Exists(fileName)
       return 10; //error code?

    using (Stream input = File.OpenRead(fileName))
    {
        xdoc = XDocument.Load(input);
    }

    var level1s = from level1 in xdoc.Descendants("ProductType")
        select new
        {
             Header = level1.Attribute("value")==null?"":level1.Attribute("value").Value,
             Children = level1.Descendants("Firmware")
        };

    TreeNode tn = new TreeNode(ParentText.ToString());

    //adding parent node
    ParentNodes.Add(tn);

    int i = 0;

    foreach (var ProductType in level1s)
    {

        //adding child node
        tn.Nodes.Add(new TreeNode(ProductType.Header));



        foreach (var child in ProductType.Children)
        {

            string childId;

            if (child.Attribute("Dependent") != null &&
                Convert.ToString(child.Attribute("Dependent").Value) == "Independent")
            {
                childId = child.Attribute("id").Value;
            }
            else if(child.Attribute("id") != null)
            {
                childId = child.Attribute("id").Value + " (Required " + Convert.ToString(child.Attribute("Dependent").Value) + ")";
            }
            else
                return 20; //error code?

            //adding sub child node
            tn.Nodes[i].Nodes.Add(new TreeNode(childId));

        }

        //go to next child node
        i++;
    }

    // expend all child node only
    if (tn.Level == 0)
        tn.Expand();
}

我刚刚在那里添加了一些想法。它可以避免在文件移动或损坏时遇到异常。

I just added some ideas there. It avoids hitting exceptions in case the file is moved or gets corrupted.

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