c# string text, enum type

Question

I am reading txt file, and I would like to separate it into some parts. This example of my TXT file:

"Part error(1) devic[3].data_type(2)"
"Escape error(3) device[10].data_type(12)"

I want to achieve such a situation that, when I have first word "Part" I would like to have enum type for it, and in switch I would like to call some function that will work with whole line, and on the other hand, when I will have first word "Escape", there will another case in switch that will call other functions. How can I do it? This is my code so far:

class Row
{
    public enum Category { Part, Escape }
    public string Error{ get; set; }
    public string Data_Type { get; set; }
    public string Device{ get; set; }
}

public object HandleRegex(string items)
{
        Row sk = new Row();
        Regex r = new Regex(@"[.]");
        var newStr = r.Replace(items, @" ");

        switch(this.category)
        {
            case Category.Part:
                //I want to call here function HandlePart with my line as a parameter
                HandlePart(newStr);
                break;
            case Category.Escape:
                //Here I want to call Function HandleEscape for line with "Escape" word
                HandleEscape(newStr);
                break;

        }
}

Isn't the bracket a regex language element? I think you should escape these caracters — Steve B
– Steve B, Commented Aug 5, 2013 at 6:16

King King · Accepted Answer · 2013-08-05 06:55:01Z

2

public object HandleRegex(string items)
{        
    Regex r = new Regex(@"[.]");
    var newStr = r.Replace(items, @" ");
    try {
     category = (Category) new EnumConverter(typeof(Category)).ConvertFromString(items.Split(new string[]{" "},StringSplitOptions.RemoveEmptyEntries)[0]);
        }
    catch {
       throw new ArgumentException("items doesn't contain valid prefix");
    }
    switch(category)
    {
        case Category.Part:
            HandlePart(newStr);
            break;
        case Category.Escape:
            HandleEscape(newStr);
            break;
    }
 }

edited Aug 5, 2013 at 6:55

answered Aug 5, 2013 at 6:29

King King

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3 Comments

Michal_LFC Over a year ago

But it has many branches. I just uploaded 2 as an example. It can even have few thousands.

King King Over a year ago

@user2592968 if so, you should add more entries to Category, at least 3 is enough.

Michal_LFC Over a year ago

There is a mistake in items.Split(" ", StringSplitOptions.RemoveEmptyEntries). It has some invalid argument. What can it be?

Romano Zumbé · Accepted Answer · 2013-08-05 06:13:03Z

1

You could use TryParse :

Category outCategory;
Enum.TryParse(this.category, out outCategory)

switch(outCategory)
        {
            case Category.Part:
                //I want to call here function HandlePart with my line as a parameter
                HandlePart(newStr);
                break;
            case Category.Escape:
                //Here I want to call Function HandleEscape for line with "Escape" word
                HandleEscape(newStr);
                break;
            default:
                // Needs to be handled
        }

answered Aug 5, 2013 at 6:13

Romano Zumbé

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3 Comments

Michal_LFC Over a year ago

Ok, but how I should make differentiation of my two case? What I mean is, how program will know that when it will read "Part" word it will have to call this specific part of code? I am normally reading each line of my txt file.

Romano Zumbé Over a year ago

You just need to read each line and execut the above code. Or do you need code to get the first word?

Michal_LFC Over a year ago

Ok, I will try this way.

MarcinJuraszek · Accepted Answer · 2013-08-05 06:30:54Z

You can create Dictionary<Category, Action<string>> and then use it to call code according to category:

static void Main(string[] args)
{
    var input = @"Part error(1) devic[3].data_type(2)
Escape error(3) device[10].data_type(12)";

    var functions = new Dictionary<Category, Action<string>>()
    {
        { Category.Part, HandlePart},
        { Category.Escape, HandleEscape }
    };

    foreach (var line in input.Split(new [] {Environment.NewLine }, StringSplitOptions.None))
    {
        Category category;
        if(Enum.TryParse<Category>(line.Substring(0, line.IndexOf(' ')), out category) && functions.ContainsKey(category))
            functions[category](line);
    }
}

static void HandlePart(string line)
{
    Console.WriteLine("Part handler call");
}

static void HandleEscape(string line)
{
    Console.WriteLine("Escape handler call");
}

Output of program above:

Part handler call
Escape handler call

No Idea For Name · Accepted Answer · 2013-08-05 06:37:55Z

0

if you read the file line by line then you can do

string str = file.ReadLine();
string firstWord = str.substring(0, str.IndexOf(' ')).Trim().ToLower();

now you have your first word you can do

switch(firstWord){
  case "escape":// your code
  case "Part":// your code
}

edited Aug 5, 2013 at 6:37

answered Aug 5, 2013 at 6:27

No Idea For Name

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1 Comment

Romano Zumbé Over a year ago

Where is the comparison to an enum?

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