Validation of texbox wpf mvvm
public class ProductModel : NotifyPropertyChangeBase , IDataErrorInfo
2: {
3: public bool IsValidating = false;
4:
5: public Dictionary Errors = new Dictionary();
6:
7: ...properties...
8:
9: public bool IsValid()
10: {
11: IsValidating = true;
12: try
13: {
14: NotifyPropertyChanged(() => Name);
15: NotifyPropertyChanged(() => Price);
16: NotifyPropertyChanged(() => Amount);
17: }
18: finally
19: {
20: IsValidating = false;
21: }
22: return (Errors.Count() == 0);
23: }
24:
25: public string Error
26: {
27: get { throw new NotImplementedException(); }
28: }
29:
30: public string this[string columnName]
31: {
32: get
33: {
34: string result = string.Empty;
35: if (!IsValidating) return result;
36: Errors.Remove(columnName);
37: switch (columnName)
38: {
39: case "Name": if (string.IsNullOrEmpty(Name)) result = "Name is required!"; break;
40: case "Price": if ((Price < 10) || (Price > 1000)) result = "Price must be between 10 and 1000"; break;
41: case "Amount": if ((Amount < 1) || (Amount > 100)) result = "Amount must be between 1 and 100"; break;
42: };
43: if (result != string.Empty) Errors.Add(columnName, result);
44: return result;
45: }
46: }
47:
48: public ProductModel()
49: {
50: }
51: }
private void SaveExecute()
2: {
3: Model.IsValid();
4: }
UserControl x:Class="WPFValidationApplication.Views.ProductForm"
2: xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
3: xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
4: xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
5: xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
6: xmlns:my="clr-namespace:WPFValidationApplication.Utils"
7: d:DesignHeight="300"
8: d:DesignWidth="448"
9: mc:Ignorable="d">
10:
11:
12:
13:
19:
20:
23:
29:
35:
41:
42:
43:
81:
public class ProductModel : NotifyPropertyChangeBase
2: {
3: private String name;
4: public String Name
5: {
6: get
7: {
8: return name;
9: }
10: set
11: {
12: name = value;
13: NotifyPropertyChanged(() => Name);
14: }
15: }
16:
17: private decimal price;
18: public decimal Price
19: {
20: get
21: {
22: return price;
23: }
24: set
25: {
26: price = value;
27: NotifyPropertyChanged(() => Price);
28: }
29: }
30:
31: private int amount;
32: public int Amount
33: {
34: get
35: {
36: return amount;
37: }
38: set
39: {
40: amount = value;
41: NotifyPropertyChanged(() => Amount);
42: }
43: }
44: }
public partial class ProductForm : UserControl
2: {
3: public ProductForm()
4: {
5: InitializeComponent();
6: this.DataContext = new ProductFormViewModel();
7: }
8: }
public class ProductFormViewModel : NotifyPropertyChangeBase
2: {
3: public ProductModel Model { get; set; }
4:
5: public ICommand SaveCommand { get; set; }
6:
7: public ProductFormViewModel()
8: {
9: Model = new ProductModel();
10: SaveCommand = new DelegateCommand(SaveExecute);
11: }
12:
13: private void SaveExecute()
14: {
15: //dummy
16: }
17: }
public class ProductModel : NotifyPropertyChangeBase
2: {
3: private String name;
4: public String Name
5: {
6: get
7: {
8: return name;
9: }
10: set
11: {
12: name = value;
13: NotifyPropertyChanged(() => Name);
14: }
15: }
16:
17: private decimal price;
18: public decimal Price
19: {
20: get
21: {
22: return price;
23: }
24: set
25: {
26: price = value;
27: NotifyPropertyChanged(() => Price);
28: }
29: }
30:
31: private int amount;
32: public int Amount
33: {
34: get
35: {
36: return amount;
37: }
38: set
39: {
40: amount = value;
41: NotifyPropertyChanged(() => Amount);
42: }
43: }
44: }
My form doesnot show up any red border or error message on button click
Mageshwaran RPosted Nov 10, 2019, 7:06 AM
Shweta LodhaPosted Sep 16, 2019, 4:00 AM