After struggled for a night, finally I end up fix it by an "ugly" workaround which I don't want to from the start. I just switch from using Dictionary<int, string>
to Dictionary<TestEnum, string>
as datasource
Datagridview combobox cell which accept enum as integer
-
08-07-2023 - |
Pregunta
I tried to override the default behavior of datagridview combox box column to make it accept enum as int. In order to do that, I created CustomComboboxCell
and CustomComboboxEditingControl
as follow:
public class CustomComboboxEditingControl : DataGridViewComboboxEditingControl
{
public override object EditingControlFormattedValue
{
get
{
return base.EditingControlFormmatedValue;
}
set
{
if(value.GetType().IsEnum)
{
//convert enum to int
base.EditingControlFormattedValue = (int)value;
}
else
{
base.EditingControlFormattedValue = value;
}
}
}
}
public class CustomComboboxCell : DatagridviewComboboxCell
{
public override Type EditType
{
return typeof(CustomComboboxEditingControl);
}
}
Then in my form, I create a datagridview with a combobox column to test this:
public enum TestEnum
{
a = 1,
b = 2,
c = 3,
}
public class Test
{
public TestEnum test {get;set;}
}
public class Form1
{
public Form1
{
Datagridview dgv = new Datagridview();
dgv.AutoGenerateColumns = false;
DatagridviewComboboxColumn col1 = new DatagridviewComboboxColumn();
col1.CellTemplate = new CustomComboboxCell();
//set datasource for col1
Dictionary<int, string> dct = new Dictionary<int, string>();
dct.Add(1, "a");
dct.Add(2, "b");
dct.Add(3, "c");
col1.Datasource = new BindingSource() {Datasource = dct};
col1.ValueMember = "key";
col1.DisplayMember = "value";
col1.DataPropertyName = "test";
dgv.Columns.Add(col1);
dgv.Invaidate();
this.Constrols.Add(dgv);
//Add datasource for datagridview
List<Test> lst = new List<Test>();
lst.Add(new Test() {test = TestEnum.a});
lst.Add(new Test() {test = TestEnum.b});
lst.Add(new Test() {test = TestEnum.c});
dgv.Datasource = new BindingList() {Datasource = lst};
}
}
I thoug that everything look perfect, but when I run the form, it still give me System.ArgumentException: DataGridViewComboboxCell value is not valid.
Please take a look at my code and tell me what did I miss?
Solución
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