c# - How can I apply MVVM and Commands in this specific WPF situation? -

-

I have trouble with the MVVM pattern and command in my WPF app. The problem is not so much that the MVVM pattern, but more than the stuff that is running on my GUI. I will explain the situation:

My app can be in some files I have a class with the function DoStuff (int limit) My user user interface has the following items: < / P>

  • button DoStuffBtn to start parsing.
  • A text box LimitTxt to fill a limit.
  • Enable or disable a checkbox .

When you uncheck " LimitChk , then LimitTxt.Text =" " and LimitTxt.IsEnabled = false . You will repeat "check" LimitChk , then LimitTxt.IsEnabled = false , but the text remains empty until you fill something .

I have read several tutorials on the command in WPF and MVVM but I do not think that my case would be inserted in that mold. The example I have given is actually a small part of my UI Is but I can not do this very well.

I am going through such questions as:

  • Do I have to command for LimitChk (enabled and disabled) or just a toggle?
  • If I type int to LimitTxt , if I drop it What happens if I do it and disable it?
  • Is it just a clean way to use DoStuff (Int32.Parse (LimitTxt.Text) > pressed ?
  • If I use two commands on LimitChk , then what happens with CanExecute () the function of ICommand Determines whether LimitChk is enabled?

The main question is: How will the situation happen? I have seen some links on WPF, Command and MVVM:

    • What do I still think that I can get as much pi from the UI There are also things like the UI affecting the UI, i.e. Unchecking LimitChk disables LimitText . Even so, I think that I should keep a distinction between information related to UI and actions and things that really need to be done with actual work.

    gt; text box text =" {binding limit} "isEnabled =" {binding limitations} "/> gt; button content =" Pars "command =" {Binding Pars Command} "/>

    You would like to start ParseCommand like this: 

      this.ParseCommand = New DelegateCommand & lt; object & gt; (parseFile);   
     Now, let's also fill that LimitTextIsEnabled property:  
      public bool LimitTextIsEnabled {// Clear comparison because checkboxes Get IISChecked is nullable. Return it. Limit IsChecked == True; } Private set {}}   
     Your  parseFile  method will then pass the value of the actual parsing logic to the value of  LimitValue .  
     I declared that  LimitValue  declares the property as a string to avoid the code with a clear converter, or other verification code, to avoid clutter. You can choose to accept"> 
     Of course, I have not implemented it completely, but I want to underline a pattern where you are not using the command to update the status of other widgets. Instead, tie these properties to properties that are managed in your Viomodalal.

    Comments

    Post a Comment

    Popular posts from this blog

    php - multilevel menu with multilevel array -

    -
    Just ask someone to solve this problem? I want to create a multilevel menu I can not find the right solution generated with multilevel array, it always gets an array_push error My study came from the original idea But still my Can not match the need. This is my MySQL [code] ----- --------------------- --------------- | ID | PARENT_ID | Name | Link | Seq | 1 | 0 | Dashboad | Dashboard / | 1 | 2 | 0 | Menu 1 | Menu 1 / | 2 | 3 | 0 | Menu 2 | Menu 2 / | 3 | 4 | 0 | Menu 3 | Menu 3 / | 4 | 5 | 2 | Joint Add / | 1 | 6 | 3 | Joint Add / | 1 | 7 | 2 | Edit | Edit / | 2 | 8 | 4 | Joint Add / | 1 ------------------------------------------ [/ Code] I want to do something like this in my array array ('dashboard' = & gt; array ('id' = & gt; '' 'Dame' = & gt; 'Dashboard', 'Title' = & gt; 'Dashboard', 'MatchMin' = & gt; Base_URL (). 'Dashboard /', 'Active' => = & Gt; NULL), ...
    Read more

    c# - TypeConverter in propertygrid only converts from string, not to -

    -
    When the property grid is reached, only the conversion mechanism (often called) is called "Foo!" Returns the property string in the grid when I click to edit I get an exception Type.oo. Object type can not be changed to type. (Not properly translated,) What is a clue from the convert format, why not? And the error indicates that it is trying to convert to a string, not from. I think that when I want to edit this object, it will have to be converted from foo to string, and when the editing ends. Public class FooTypeConverter: StringConverter {public override object ConvertFrom (ITypeDescriptorContext Reference, CultureInfo Culture, Object Value) {New Foo (string) value); } Convert the public override object (Type the ITE DiskText Contact Reference, CultureInfo Culture, Object Value, Type Type) {Return "Foo!"; } Public override bool CanConvertFrom (ITypeDescriptorContext reference, type source type) {back true; } Public Override Bull CanConvertTo (ITypeDescrip...
    Read more

    jQuery UI: Datepicker month format -

    -
    I am trying to change the format of the month that shows in the popup (not in the date that the picker actually I do not have any choice anywhere to do this, do I like to use a sub-string () or something else? What I normally display is Trying to change: Class = "ui-datepicker-title"> January & lt; / span & gt; ... & lt; / div & gt; Div>
    Read more