How to set property and field values programmatically in WPF DataGrid?

Question

I'm trying to create an DataGrid that automatically generates itself according to the Property and Fields coming from the different classes. Each class is created as a row and each property or field as a column. These classes have thousands of same Fields and Properties, but their values are different.

There is no way to bind fields to DataGrid. So thats why i created columns dynamically like in this post: How to add Fields to DataGrid in WPF?. After running the code snippet below, I put the created properties from dynamic List (named dataObjects) to columns and then added the columns i created to DataGrid.

//Get all properties and fields from classes and send them into dynamic list
private void Property_ve_Field_Dinamik_Objeye_At()
{
    //Sinif_Tutucu is an ObservableCollection which holds all Classes.
    foreach (var item in Sinif_Tutucu)
    {
        //Get all fields from class
        var fields = item.GetType().GetFields();
        //Gett all properties from class
        var properties = item.GetType().GetProperties();

        dataObject = new System.Dynamic.ExpandoObject();

        foreach (var field in fields)
        {
            dataObjectValues = (IDictionary<string, object>)dataObject;
            dataObjectValues[field.Name] = field.GetValue(item);
        }
        foreach (var property in properties)
        {
            dataObjectValues = (IDictionary<string, object>)dataObject;
            dataObjectValues[property.Name] = property.GetValue(item);
        }

        dataObjects.Add(dataObject);
    }

    dataObjectValues = dataObjects[0];
}

Here is definitions of variables used in the code above;

//Holds all classes
private ObservableCollection<object> _Sinif_Tutucu_ = new ObservableCollection<object>();
public ObservableCollection<object> Sinif_Tutucu //<--I'm getting the properties and fields from the classes in it.
{
    get { return _Sinif_Tutucu_; }
    set
    {
        if (value != _Sinif_Tutucu_)
        {
            this._Sinif_Tutucu_ = value;
        }
    }
}

//Holds rows and columns dynamically
private List<dynamic> _dataObjects_ = new List<dynamic>();
public List<dynamic> dataObjects //<-- This list is updating when i edit an item.
{
    get { return _dataObjects_; }
    set
    {
        if (value != _dataObjects_)
        {
            this._dataObjects_ = value;
        }
    }
}

dynamic dataObject;

IDictionary<string, object> dataObjectValues;

And DataGrid's source is like this;

DataGrid_1.ItemsSource = dataObjects;

Everything is so beautiful up to here. My DataGrid gets all fields and properties from all classes i have defined and shows their values correctly. When I edit the cells, I want it set the properties and fields in the classes. (SelectionMode = Single and SelectionUnit = Cell) But it doesn't update because I used the code I put above. Thats why, the values in the DataGrid are no longer directly binded to the class. They are binded to the dynamic List. When I edit the values in the DataGrid, dynamic List is updated only instead of the property or fields in the classes.

When a value is edited, I tried to set it in the class it belongs to. But i don't want to do this manually. Because there is thousands of property and field. So i can't set them one by one. Program should understand which value i am changing in the DataGrid and which property or field going to be updated. Then it should update property or field in that class.

Or the list I am currently using is already being updated. It can be in a system that sets all values in the list to properties and fields in classes when I press the button. (If anyone can tell me how to to this, this would be more useful. But any other solutions are can be too)

I tried to do the solutions I mentioned in the last two paragraphs but failed. I am new in the WPF world and still have problems coding. If there is any mistake in my English, sorry for that. I am learning English too. Finally, I've included a diagram below to make it clearer what I'm trying to do. Here is the diagram.

score 1 · Accepted Answer · answered Aug 18 '20 at 11:09

No answers.

It took me 8 days and I found the solution by trying. Here is the solution;

dataObjects' type is List<dynamic> and dataObjectValues' type is IDictionary<string, object>. It consists of dataObjects dataObjectValues. DataGrid's ItemSource is dataObjects. When i edit DataGrid, values are written to the list. Then I update the classes one by one using the list.

public void Siniflara_Veri_Yaz()
{
    //Loop for rows
    for (int i = 0; i<dataObjects.Count; i++)
    {
        //Get row
        dataObjectValues = dataObjects[i];

        //Loop for Column
        for (int j = 0; j < dataObjectValues.Count; j++)
        {
            string Binding_Path = DataGrid_1.Columns[j].SortMemberPath;
            //Get PropertyInfo if exist
            PropertyInfo propInfo = Sinif_Tutucu[i].GetType().GetProperty(Binding_Path);

            //If doesn't exist, it have to be a Field
            if(propInfo != null)
            {
                //DataGrid uses textColumn (string)
                //Get column types from Classes and cast string to whatever type the column is.
                dataObjectValues[Binding_Path] = Tip_Degistir(propInfo.PropertyType.Name, dataObjectValues[Binding_Path].ToString());
                propInfo.SetValue(Sinif_Tutucu[i], dataObjectValues[Binding_Path]);
            }
            //Same thing but for fields
            else
            {
                FieldInfo fieldInfo = Sinif_Tutucu[i].GetType().GetField(Binding_Path);
                dataObjectValues[Binding_Path] = Tip_Degistir(fieldInfo.FieldType.Name, dataObjectValues[Binding_Path].ToString());
                fieldInfo.SetValue(Sinif_Tutucu[i], dataObjectValues[Binding_Path]);
            }
        }
    }
}

Edit 1:

Sinif_Tutucu is an ObservableCollection which holds all classes I added to the DataGrid.

How to set property and field values programmatically in WPF DataGrid?

1 Answers1

Edit 1: