WPF Datagrid Databind 到具有静态属性的类和包含动态属性值条目的字典

发布于 2024-11-09 11:27:36 字数 5662 浏览 0 评论 0原文

更新

我正在更新这篇文章,因为我做了更多阅读并决定重新实现我的解决方案。

原始问题:我有一个具有静态属性的类和一个属性,该属性是属性的动态集合(通过字典)。我想将我的类数据绑定到 wpf 数据网格,其中每个静态属性应该是一列,每个字典条目应该是网格中的一列。

经过更多研究后,我决定实现一个 PropertyBag 类,其中包含我的属性和值字典。现在几乎一切都正常。我的网格显示了所有正确的列,并且静态属性值被正确应用。

但是,现在我无法从字典中获取任何要应用于网格的值,并且我不知道从这里该去哪里。

更多信息:

我的数据库有 3 个表,一个盘子、一个类别和一个类别盘子关联表。每个板块可以有0到多个类别。现在,我正在用所有类别填充每个板并将字符串设置为空。然后,当返回关联(在板和类别之间)时,我将设置特定类别名称的实际值。这一切都发生在创建网格之前。

属性包:

public class PropertyBag
{
    private readonly Dictionary<string, string> values = new Dictionary<string, string>();

    public string this[string key]
    {
        get 
        {
            string value;
            values.TryGetValue(key, out value);
            return value;
        }
        set
        {
            if (value == null) values.Remove(key);
            else values[key] = value;
        }
    }
}

修订的 Plate 类

[TypeDescriptionProvider(typeof(PlateTypeDescriptionProvider))]
public class Plate : INotifyPropertyChanged
{
    public int ID;
    private string name;
    private string status;
    private string creator;
    private Uri location;
    private string description;

    public Plate()
    {
        CustomCategories = new PropertyBag();
    }

    public PropertyBag CustomCategories { get; set; }

    public string Name
    {
        get { return name;}
        set
        {
            name = value;
            NotifyPropertyChanged("Name");
        }
    }

    public string Status
    {
        get { return status; }
        set
        {
            status = value;
            NotifyPropertyChanged("Status");
        }
    }

    public string Creator
    {
        get { return creator; }
        set
        {
            creator = value;
            NotifyPropertyChanged("Creator");
        }
    }

    public Uri Location
    {
        get { return location; }
        set
        {
            location = value;
            NotifyPropertyChanged("Location");
        }
    }

    public string Description
    {
        get { return description; }
        set
        {
            description = value;
            NotifyPropertyChanged("Description");
        }
    }

    public static Plate ConvertDataPlateToBusinessPlate(TestPlate dataPlate)
    {
        var plate = new Plate
                        {
                            Name = dataPlate.Name, 
                            Status = dataPlate.Status,
                            Creator = dataPlate.Creator, 
                            Description = dataPlate.Description, 
                            Location = new Uri(dataPlate.Location)
                        };
        return plate;
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

修订的 CustomTypeDescriptor:

public override PropertyDescriptorCollection GetProperties()
    {
        return GetProperties(null);
    }

    public override PropertyDescriptorCollection GetProperties(Attribute[] attributes)
    {
        var properties = new ArrayList();
        foreach (PropertyDescriptor propertyDescriptor in base.GetProperties(attributes))
        {
            if(propertyDescriptor.PropertyType.Equals(typeof(PropertyBag)))
            {
                //Static list of all category names
                var categoryNames = Categories.GetAll();
                foreach (var categoryName in categoryNames)
                {
                    properties.Add(new PropertyBagPropertyDescriptor(categoryName));
                }
            }
            else
            {
                properties.Add(propertyDescriptor);
            }

        }
        var props = (PropertyDescriptor[])properties.ToArray(typeof(PropertyDescriptor));
        return new PropertyDescriptorCollection(props);
    }

修订的 PropertyDescriptor

    public class PropertyBagPropertyDescriptor : PropertyDescriptor
{
    public PropertyBagPropertyDescriptor(string name) : base(name, null)
    {}

    public override bool CanResetValue(object component)
    {
        return true;
    }

    public override object GetValue(object component)
    {
        return ((PropertyBag) component)[Name];
    }

    public override void ResetValue(object component)
    {
        ((PropertyBag)component)[Name] = null;
    }

    public override void SetValue(object component, object value)
    {
        ((PropertyBag) component)[Name] = (string) value;
    }

    public override bool ShouldSerializeValue(object component)
    {
        return ((PropertyBag)component)[Name] != null;
    }

    public override Type ComponentType
    {
        get { return typeof(PropertyBag); }
    }

    public override bool IsReadOnly
    {
        get { return false; }
    }

    public override Type PropertyType
    {
        get { return typeof(string); }
    }
}

简单 ViewModel

 public TestPlateAdministratorViewModel()
    {
        CommandAggregator = new TestPlateAdministratorCommandAggregator(this);
        LoadData();
    }

    public static TestPlateAdministratorCommandAggregator CommandAggregator { get; set; }
    public ObservableCollection<Plate> TestPlates{ get; set; }

    private static void LoadData()
    {
        CommandAggregator.LoadPlatesCommand.Execute(null);
        CommandAggregator.LoadCategoriesCommand.Execute(null);
    }
}

UPDATED

I am updating this post because I did some more reading and decided to re-implement my solution.

Original Problem: I have a class with static properties and one Property that is a dynamic collection of properties (via a dictionary). I want to databind my class to a wpf datagrid where each static property should be a column and each dictionary entry should be a column in the grid.

After doing some more research, I decided to implement a PropertyBag class that will contain my Dictionary of properties and values. Almost everything is working now. I have my grid being displayed with all the correct columns and the static property values are being applied correctly.

However, now I am not able to get any of the values from the dictionary to be applied to the grid, and I am not sure where to go from here.

More info:

My database has 3 tables, a plate, a category, and a categoryplateassociation table. Each plate can have 0 to many categories. For now, I am populating each plate with all the categories and setting the strings to empty. Then, when an association is returned (between a plate and category), I am setting the real value on the specific category name. This all happens before the grid is created.

Property Bag:

public class PropertyBag
{
    private readonly Dictionary<string, string> values = new Dictionary<string, string>();

    public string this[string key]
    {
        get 
        {
            string value;
            values.TryGetValue(key, out value);
            return value;
        }
        set
        {
            if (value == null) values.Remove(key);
            else values[key] = value;
        }
    }
}

Revised Plate class

[TypeDescriptionProvider(typeof(PlateTypeDescriptionProvider))]
public class Plate : INotifyPropertyChanged
{
    public int ID;
    private string name;
    private string status;
    private string creator;
    private Uri location;
    private string description;

    public Plate()
    {
        CustomCategories = new PropertyBag();
    }

    public PropertyBag CustomCategories { get; set; }

    public string Name
    {
        get { return name;}
        set
        {
            name = value;
            NotifyPropertyChanged("Name");
        }
    }

    public string Status
    {
        get { return status; }
        set
        {
            status = value;
            NotifyPropertyChanged("Status");
        }
    }

    public string Creator
    {
        get { return creator; }
        set
        {
            creator = value;
            NotifyPropertyChanged("Creator");
        }
    }

    public Uri Location
    {
        get { return location; }
        set
        {
            location = value;
            NotifyPropertyChanged("Location");
        }
    }

    public string Description
    {
        get { return description; }
        set
        {
            description = value;
            NotifyPropertyChanged("Description");
        }
    }

    public static Plate ConvertDataPlateToBusinessPlate(TestPlate dataPlate)
    {
        var plate = new Plate
                        {
                            Name = dataPlate.Name, 
                            Status = dataPlate.Status,
                            Creator = dataPlate.Creator, 
                            Description = dataPlate.Description, 
                            Location = new Uri(dataPlate.Location)
                        };
        return plate;
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

Revised CustomTypeDescriptor:

public override PropertyDescriptorCollection GetProperties()
    {
        return GetProperties(null);
    }

    public override PropertyDescriptorCollection GetProperties(Attribute[] attributes)
    {
        var properties = new ArrayList();
        foreach (PropertyDescriptor propertyDescriptor in base.GetProperties(attributes))
        {
            if(propertyDescriptor.PropertyType.Equals(typeof(PropertyBag)))
            {
                //Static list of all category names
                var categoryNames = Categories.GetAll();
                foreach (var categoryName in categoryNames)
                {
                    properties.Add(new PropertyBagPropertyDescriptor(categoryName));
                }
            }
            else
            {
                properties.Add(propertyDescriptor);
            }

        }
        var props = (PropertyDescriptor[])properties.ToArray(typeof(PropertyDescriptor));
        return new PropertyDescriptorCollection(props);
    }

Revised PropertyDescriptor

    public class PropertyBagPropertyDescriptor : PropertyDescriptor
{
    public PropertyBagPropertyDescriptor(string name) : base(name, null)
    {}

    public override bool CanResetValue(object component)
    {
        return true;
    }

    public override object GetValue(object component)
    {
        return ((PropertyBag) component)[Name];
    }

    public override void ResetValue(object component)
    {
        ((PropertyBag)component)[Name] = null;
    }

    public override void SetValue(object component, object value)
    {
        ((PropertyBag) component)[Name] = (string) value;
    }

    public override bool ShouldSerializeValue(object component)
    {
        return ((PropertyBag)component)[Name] != null;
    }

    public override Type ComponentType
    {
        get { return typeof(PropertyBag); }
    }

    public override bool IsReadOnly
    {
        get { return false; }
    }

    public override Type PropertyType
    {
        get { return typeof(string); }
    }
}

simple ViewModel

 public TestPlateAdministratorViewModel()
    {
        CommandAggregator = new TestPlateAdministratorCommandAggregator(this);
        LoadData();
    }

    public static TestPlateAdministratorCommandAggregator CommandAggregator { get; set; }
    public ObservableCollection<Plate> TestPlates{ get; set; }

    private static void LoadData()
    {
        CommandAggregator.LoadPlatesCommand.Execute(null);
        CommandAggregator.LoadCategoriesCommand.Execute(null);
    }
}

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评论(1

等数载,海棠开 2024-11-16 11:27:36

PropertyBag 中的字典是否具有固定大小或者键是否已知?

您没有为数据网格发布 xaml,但从 propertybag 到一列的绑定可能如下所示:

<DataGridTextColumn Header="Col4TestKey" Binding="{Binding CustomCategories[test]}"/>

我真的不知道您的 PropertyBag setter 是否可以与绑定一起使用。总而言之,如果您有一组已知的字典键,那么这一切都会起作用。

顺便说一句,我在我的项目中使用平面数据表来处理这种动态的东西,真的很容易处理。

does your Dictionary in your PropertyBag has a fixed size or does the keys are known?

you did not post your xaml for your datagrid, but the binding from the propertybag to one column could look like this:

<DataGridTextColumn Header="Col4TestKey" Binding="{Binding CustomCategories[test]}"/>

i really dont know wether your PropertyBag setter will work with binding. all in all this just would work if you have a know set of keys for your dictionary.

btw, i use flat datatables in my projects for such dynamic stuff, there are really easy to handle.

~没有更多了~
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