I have a datagrid which gets data like this:
public struct MyData
{
public string name { set; get; }
public string artist { set; get; }
public string location { set; get; }
}
DataGridTextColumn col1 = new DataGridTextColumn();
col4.Binding = new Binding("name");
dataGrid1.Columns.Add(col1);
dataGrid1.Items.Add((new MyData() { name = "Song1", artist = "MyName", location = "loc"}));
dataGrid1.Items.Add((new MyData() { name = "Song2", artist = "MyName", location = "loc2"}));
The problem is- whenever a user tries to edit a cell or drags multiple cells- the app throws an exception:
System.InvalidOperationException was unhandled
Message: 'EditItem' is not allowed for this view.
Why is this? Is it because of the way the data is entered?
Any ideas?
Thanks!
I got this issue when assigning ItemsSource to IEnumerable<T>.
I fixed it by converting the IEnumberable<T> to a List<T> and then assigning that to ItemsSource.
I'm not sure why using IEnumerable caused that issue, but this change fixed it for me.
Instead of using a struct use a class instead.
UPDATED ANSWER: Try adding your MyData instances to a List then assigning that list to the DataGrid.ItemsSource
If you use datagrid DataGridCheckBoxColumn you need to set <Setter Property="IsEditing" Value="true" />
on check box column. See this: https://stackoverflow.com/a/12244451/1643201
This answer is not my own, just the working code example suggested by AnthonyWJones.
public class MyData //Use class instead of struct
{
public string name { set; get; }
public string artist { set; get; }
public string location { set; get; }
}
DataGridTextColumn col1 = new DataGridTextColumn();
col4.Binding = new Binding("name");
dataGrid1.Columns.Add(col1);
dataGrid1.Items.Add((new MyData() { name = "Song1", artist = "MyName", location = "loc"}));
dataGrid1.Items.Add((new MyData() { name = "Song2", artist = "MyName", location = "loc2"}));
//Create a list of MyData instances
List<MyData> myDataItems = new List<MyData>();
myDataItems.Add(new MyData() { name = "Song1", artist = "MyName", location = "loc"});
myDataItems.Add(new MyData() { name = "Song2", artist = "MyName", location = "loc2"});
//Assign the list to the datagrid's ItemsSource
dataGrid1.ItemsSource = items;
For my case,
processLimits.OrderBy(c => c.Parameter);
returns an
IOrderedEnumerable<ProcessLimits>
not a
List<ProcessLimits>
so when I assign a style for my event setter to a checkbox column in my datagrid
style.Setters.Add(new EventSetter(System.Windows.Controls.Primitives.ToggleButton.CheckedEvent, new RoutedEventHandler(ServiceActiveChecked)));
ServiceActiveChecked is never called and I got
'EditItem' is not allowed for this view.
and for anyone else doing checkboxes in datagrid columns, I use a column object with my column data in this constructor for adding the data grid I use with adding the style above.
datagridName.Columns.Add(new DataGridCheckBoxColumn()
{
Header = column.HeaderText.Trim(),
Binding = new System.Windows.Data.Binding(column.BindingDataName.Trim()) { StringFormat = column.StringFormat != null ? column.StringFormat.Trim().ToString() : "" },
IsReadOnly = column.IsReadOnlyColumn,
Width = new DataGridLength(column.DataGridWidth, DataGridLengthUnitType.Star),
CellStyle = style,
});
I solved this by setting the datagrid's source after the InitializeComponent:
public MainWindow()
{
InitializeComponent();
FilterGrid.ItemsSource = ScrapeFilter;
}
Related
i want to show some values in a data Grid and these values are not from database.
I am making a POS in which when user enters an item it should be shown to him/her in a data grid form.
This is what i've tried and my mistake was i didn't bind the "Name","Price" but now i've correct it and now it works perfectly
public struct MyData
{
public int Price { set; get; }
public string Name { set; get; }
}
public MainWindow()
{
InitializeComponent();
DataGridTextColumn grid_C1 = new DataGridTextColumn();
DataGridTextColumn grid_C2 = new DataGridTextColumn();
dGrid.Columns.Add(grid_C1);
dGrid.Columns.Add(grid_C2);
grid_C1.Binding = new Binding("Name");
grid_C2.Binding = new Binding("Price");
grid_C1.Header = "Name";
grid_C2.Header = "Price";
dGrid.Items.Add(new MyData { Name = "dumyText", Price = 2 });
dGrid.Items.Add(new MyData { Name = "dumyText", Price = 2 });
}
Here's how I am making my GridView:
The ListView will contain Entry objects which looks like this:
public class Entry
{
public Entry(BitmapImage icon = null, List<EntryKeyValuePair> entryKeyValuePairs = null)
{
Icon = icon;
EntryKeyValuePairs = entryKeyValuePairs ?? new List<EntryKeyValuePair>();
}
public BitmapImage Icon { get; set; }
public List<EntryKeyValuePair> EntryKeyValuePairs { get; }
}
EntryKeyValuePair is just a KeyValuePair<string,string> where Key is the Column and Value is the value of the column. I used a List of KeyValuePair because I want to preserve insertion order. Anyway, here's how I am constructing the GridView.
GridView = new GridView();
foreach (Column column in Category.Columns.Where(c => c.IsVisibleInTable)) {
var gridViewColumn = new GridViewColumn {
Header = column.Name,
DisplayMemberBinding = new Binding($"EntryKeyValuePairs[{column.Name}].Value")
};
GridView.Columns.Add(gridViewColumn);
}
I don't know what binding to set in DisplayMemberBinding. The above binding would work if EntryKeyValuePairs was a dictionary. But in my case it is not.
If I had access to the data object somehow, I could do
DisplayMemberBinding = new Binding($"EntryKeyValuePairs[{entry.EntryKeyValuePairs.FindIndex(p => p.Key == column.Name)}].Value")
How can I access the current Data Object which the ListView is holding while binding?
I found a solution. I used the GridViewColumn's CellTemplateSelector so that I can get a reference to the ListViews bound object. Here is how the CellTemplateSelector looks like. I had to create the DataTemplates in code.
class GridViewCellTemplateSelector : DataTemplateSelector
{
private readonly string _columnName;
public GridViewCellTemplateSelector(string columnName)
{
_columnName = columnName;
}
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
var entry = (Entry)item;
var dataTemplate = new DataTemplate {
DataType = typeof (Entry)
};
var stackPanelFactory = new FrameworkElementFactory(typeof(StackPanel));
stackPanelFactory.SetValue(StackPanel.OrientationProperty, Orientation.Vertical);
var text = new FrameworkElementFactory(typeof(TextBlock));
text.SetBinding(TextBlock.TextProperty, new Binding($"EntryKeyValuePairs[{entry.EntryKeyValuePairs.FindIndex(p => p.Key == _columnName)}].Value"));
stackPanelFactory.AppendChild(text);
dataTemplate.VisualTree = stackPanelFactory;
return dataTemplate;
}
}
Instead of DisplayMemberBinding, I used this TemplateSelector:
CellTemplateSelector = new GridViewCellTemplateSelector(column.Name)
All good. Hope this helps someone :) I still hope to see a better solution than this.
This is my object structure
class object
{
string projectname;
string projectid;
list<string> associated_students;
}
//The List I am binding to the grid
list<objects> objectList = getList();
dataGridView.Source =objectList;
Now I want to bind the combo box inside the datagrid with the list "associated_students"
If I understand the question, you want each row to be tied to an object within your list of objects and you want the third column to show a combobox of that object's unique list of associated students. If I am correct, a simple search leads to this similar question:
How do I set up a DataGridView ComboBoxColumn with a different DataSource in each cell?
To solve, you need to manually bind each row. I was able to duplicate your problem and came up with this solution:
Your class "object"
public class Assignment
{
public Assignment()
{
this.Associated_Students = new List<string>();
}
public string ProjectName { get; set; }
public string ProjectID { get; set; }
public List<string> Associated_Students { get; set; }
}
And in Form1:
public Form1()
{
InitializeComponent();
this.Assignments = new List<Assignment>()
{
new Assignment()
{
ProjectID = "1",
ProjectName = "First",
Associated_Students = new List<string>() { "Me", "You", "Him", "Her" }
},
new Assignment()
{
ProjectID = "2",
ProjectName = "Second",
Associated_Students = new List<string>() { "Foo", "Bar" }
}
};
this.BindDGViewToList();
}
public List<Assignment> Assignments { get; set; }
public void BindDGViewToList()
{
DataGridViewTextBoxColumn col1 = new DataGridViewTextBoxColumn();
col1.Name = "Project Name";
col1.ValueType = typeof(string);
dataGridView1.Columns.Add(col1);
DataGridViewTextBoxColumn col2 = new DataGridViewTextBoxColumn();
col2.Name = "Project ID";
col2.ValueType = typeof(string);
dataGridView1.Columns.Add(col2);
DataGridViewComboBoxColumn col3 = new DataGridViewComboBoxColumn();
col3.Name = "Associated Students";
col3.ValueType = typeof(string);
dataGridView1.Columns.Add(col3);
for (int i = 0; i < this.Assignments.Count; i++)
{
DataGridViewRow row = (DataGridViewRow)(dataGridView1.Rows[0].Clone());
DataGridViewTextBoxCell textCell = (DataGridViewTextBoxCell)(row.Cells[0]);
textCell.ValueType = typeof(string);
textCell.Value = this.Assignments[i].ProjectName;
textCell = (DataGridViewTextBoxCell)(row.Cells[1]);
textCell.ValueType = typeof(string);
textCell.Value = this.Assignments[i].ProjectID;
DataGridViewComboBoxCell comboCell = (DataGridViewComboBoxCell)(row.Cells[2]);
comboCell.ValueType = typeof(string);
comboCell.DataSource = this.Assignments[i].Associated_Students;
dataGridView1.Rows.Add(row);
}
}
Note: This will display what you are asking for but you will have to handle updating your data. I would suggest researching BindingList over List objects. There may be better solutions, but this worked quickly for me.
I have an object with child object(s) and I load it using linq. And I assign it to a treeView's itemssource.
treeView.DisplayMemberPath = "Name";
treeView.ItemsSource = tasks;
It shows only the parent nodes (task.name), I couldn't figure out how to add children (TaskItems.name).
All the examples show HierarchicalData in xaml. I need to do it in code-behind, just like the above code. Is it possible?
public class Task
{
public int Id;
public string Name;
public bool IsActive;
public List<TaskItem> TaskItems = new List<TaskItem>();
}
public class TaskItem
{
public int TaskId;
public string Name;
public string Value;
}
--------------
var tasks1 = from t in xd.Descendants("taskheader")
select new Task
{
Id = (int)t.Element("id"),
Name = t.Element("name").Value,
IsActive = t.Element("isactive").Value == "1",
TaskItems = t.Elements("taskdetail").Select(e => new TaskItem
{
TaskId = (int)e.Element("taskid"),
Name = (string)e.Element("name"),
Value = (string)e.Element("value"),
}).ToList()
};
--------------
List<Task> tasks = new List<Task>();
tasks = tasks1;
You can create a HierarchicalDataTemplate in code and assign it to the treeView.ItemTemplate property. That really is the best way of going about this, as well as the "right" WPF way.
I'm trying to bind a List<T> to a DataGridView control, and I'm not having any luck creating custom bindings.
I have tried:
gvProgramCode.DataBindings.Add(new Binding("Opcode",code,"Opcode"));
It throws an exception, saying that nothing was found by that property name.
The name of the column in question is "Opcode". The name of the property in the List<T> is Opcode.
ANSWER EDIT: the problem was that I did not have the bindable fields in my class as properties, just public fields...Apparently it doesn't reflect on fields, just properties.
Is the property on the grid you are binding to Opcode as well?.. if you want to bind directly to List you would just DataSource = list. The databindings allows custom binding. are you trying to do something other than the datasource?
You are getting a bunch of empty rows? do the auto generated columns have names? Have you verified data is in the object (not just string.empty) ?
class MyObject
{
public string Something { get; set; }
public string Text { get; set; }
public string Other { get; set; }
}
public Form1()
{
InitializeComponent();
List<MyObject> myList = new List<MyObject>();
for (int i = 0; i < 200; i++)
{
string num = i.ToString();
myList.Add(new MyObject { Something = "Something " + num , Text = "Some Row " + num , Other = "Other " + num });
}
dataGridView1.DataSource = myList;
}
this should work fine...
I can't really tell what you're trying to do with the example you included, but binding to a generic list of objects is fairly straightforward if you just want to list the objects:
private BindingSource _gridSource;
private BindingSource GridSource
{
get
{
if (_gridSource == null)
_gridSource = new BindingSource();
return _gridSource;
}
}
private void Form1_Load(object sender, EventArgs e)
{
List<FluffyBunny> list = new List<FluffyBunny>();
list.Add(new FluffyBunny { Color = "White", EarType = "Long", Name = "Stan" });
list.Add(new FluffyBunny { Color = "Brown", EarType = "Medium", Name = "Mike" });
list.Add(new FluffyBunny { Color = "Mottled", EarType = "Short", Name = "Torvald" });
GridSource.DataSource = list;
dataGridView1.Columns["EarType"].Visible = false; //Optionally hide a column
dataGridView1.DataSource = GridSource;
}
If you only want to display specific properties of the List's type you should be able to make the unwanted column(s) invisible.
Technically, you don't really need to create the BindingSource, but I find it's a whole lot easier when I'm doing updates or changes if I have it.
Hope this helps.
Had the same issue... I had a struct with public fields obviously. nothing in the grid. provided public getters, worked.
Another solution I've found is to use the BindingList collection.
private void Form1_Load(object sender, EventArgs e)
{
BindingList people= new BindingList {
new Person {Name="John",Age=23},
new Person {Name="Lucy",Age=16}
};
dataGridView1.DataSource= people;
}
It works fine for me,