bindingsource

问题 Is it possible to use the Find method of a BindingSource on multiple columns? For example, say I have a gridview displaying current pets; two comboboxes, cboPetType and cboGender; and a button to create a new record into the Pet table based on the values of these two comboboxes. Now, let's say I only want one of each PetType/Gender combination (Dog - M, Cat - F, etc.). So, if I have a Dog - M pet in my BindingSource and a user selects Dog and M from the comboboxes, I would like to stop the

问题 If I filter a BindingSource's column like this: "column1 LIKE '%John%'" , then all rows containing John on that column will return. How to return all rows for which column1 contains [some text]John[some text]Doe ? "column1 LIKE '%John%Doe'" does not work. 回答1: Per the documentation at http://msdn.microsoft.com/en-us/library/system.data.datacolumn.expression.aspx Wildcard Characters Both the * and % can be used interchangeably for wildcard characters in a LIKE comparison. If the string in a

问题 I am using BindingSource.Filter to filter data on my datagridview. I used the following code: BindingSource bs = new BindingSource(); bs.DataSource = datagridview1.DataSource; bs.Filter = "columnName like '%" + textBox1.Text + "%'"; datagridview1.DataSource = bs; This code works. But when I filter data on a two-word column, the code does not work anymore. I tried putting apostrophe on those words like 'column name' like '%" + tbFilter.Text + "%' , but this does not help. Please help me find

问题 I have a: someBindingSource.DataSource = someDataSource; And I also do: someDataSource = foo(); foo() does new for another data source with different data. I don't think it's correct to do the assignment every time the data source changes, i.e: someDataSource = foo(); someBindingSource.DataSource = someDataSource; so is there a way to make someBindingSource aware of change in someDataSource ? 回答1: If the data source implements IBindingList inteface, then the BindingSource will be informed of

问题 You can use the Filter property of a BindingSource to do SQL like filtering. For example: bindingSource.Filter= "Activated = 1" Is there something like documentation on the exact syntax of this? I would like to check if a field is not DBNull, so i tried "Field != NULL" but it gives a syntax error. 回答1: The syntax is generally the same as what would you would use in a SQL Where clause, without the "Where", so in this case, it would be bindingSource.Filter = "Field <> NULL"; If you look at msdn

问题 I'm having a problem with binding data to the DataGridView. I have a class MyDataGridView that inherit from DataGridView. My data grid view data source is a BindingSource object that holds a DataTable as the data source. Problem is, when I make changes via (my) DataGridView object - the rowState stays on 'unmodified' instead of modified; even though the values in the DataTable changed (that's what makes my update not work, since it consider the rowState as undefined). Notice that making

问题 I'm trying to create a DataGridTableStyle object so that I can control the column widths of a DataGrid. I've created a BindingSource object bound to a List. Actually it's bound to an anonymous type list created though Linq in the following manner (variable names changed for clarity of what I'm doing): List<myType> myList = new List<myType>(someCapacity); . ...populate the list with query from database... . var query = from i in myList select new { i.FieldA, i.FieldB, i.FieldC };

问题 I have a DataGridView with a Binding-Source bound to a Data-Table loaded from an Oracle-Database. (btw. I don't think that the Database-Connection could cause this) I have also a DataGridViewComboBoxColumn bound to an class of persons (only "has" ID and name), so I can display / allow to edit the name instead of the ID. My problem is now that after the data-binding is completed c# automatically "selects" the first cell of the DGV - see the attached picture. I also have to use this little

问题 I have few comboboxes. I initialize their datasources through binding sources (I use EF6). My Combobox Tasks looks like this: So, when I set AutoCompleteMode property to Suggested, the auto complete doesn't work. The weird thing, is that I have two another comboboxes, with (I would say) the exact same setup, and they work...The autocompletion works on them. How to debug this? 回答1: To set up a ComboBox that automatically completes the user's input string, we need to configure 3 different

问题 What is the correct order of processing an insert from a data-bound control using BindingSource, DataSet, and TableAdapter? This is causing me eternal confusion. I have a form that is used to add a new row. Before showing the form, I call: bindingSource.AddNew(); bindingSource.MoveLast(); Upon Save, I call: bindingSource.EndEdit(); tableAdapter.Insert([the row given to me as bindingSource.Current]); The problem is that if I don't call EndEdit() , the changes of the TextBox with the current