bindingsource

问题 I want to customize the addition of a new item into a BindingSource (all strongly-typed) as described on the following MSDN Article: How to: Customize Item Addition with the Windows Forms BindingSource The code below results in InvalidOperationException : Objects added to a BindingSource's list must all be of the same type. Also, the object myTypesBindingSource.Current seems to be a DataRowView with my relevant row inside. How can I customize the addition of a strongly-typed BindingSource ?

问题 I want to display a list of people in a DataGridView in a Windows Forms app. I want my service layer to return a list of Person objects (e.g., IList<Person> ). I want changes in the list to be reflected in the DataGridView and vice versa. My understanding is that using the BindingSource facilitates working with DataGridView . My question is for the two-way databinding to work, do I need: //pseudo code BindingSource.DataSource = IBindingList<Person> or can I do: BindingSource.DataSource =

问题 I have a labels that need values retreieved from a Database. I am able to query the database but how can I extract values from a DataTable and place them in the appropiate labels Thanks 回答1: In DataTable you have rows and columns. To select a particular cell you need to do this: label1.Text = dataTable[0][0]; This will set the label1 text to Row 0, Column 0 value. To iterate through each row use: foreach(DataRow row in dataTable.Rows) { Console.WriteLine(row["ColumnName1"]); Console.WriteLine

问题 I've got a Windows Form with a button and a datagridview. The project includes a working database connection and LINQ to SQL class. I'm trying to bind the datagridview to the LINQ to SQL. In a code module I've got this: Public Function DataGridList() As BindingSource Dim NewBindingSource As New BindingSource() Dim db As New DataClasses1DataContext() NewBindingSource.DataSource = _ From Block In db.BLOCK_ASSIGNMENTs Where Block.gr912_school = "Franklin" Select Block.gr6_school Distinct Return

问题 As per my previous question, Make properties available for data binding through some kind of interface in .NET?, I managed, with the help of @Marc Gravell that by implementing the interface ICustomTypeDescriptor I can provide the form designer with custom properties that may or may not actually be visible on the component in question as real normal properties. I managed this, but my implementation is flawed. The biggest problem I have now is that if I drop a component on my form, which has

问题 I have defined classes: public class Parent : IParent { public string ParentText { get { return "ParentText"; } } } public interface IParent { string ParentText { get;} } public class Child : Parent, IChild { public string ChildText { get { return "ChildText"; } } } public interface IChild : IParent { string ChildText { get;} } When I try to bind control to IChild instance, I can do this for ChildText property, but not for ParentText property. if I try to bind to Child instance, both

问题 I have defined classes: public class Parent : IParent { public string ParentText { get { return "ParentText"; } } } public interface IParent { string ParentText { get;} } public class Child : Parent, IChild { public string ChildText { get { return "ChildText"; } } } public interface IChild : IParent { string ChildText { get;} } When I try to bind control to IChild instance, I can do this for ChildText property, but not for ParentText property. if I try to bind to Child instance, both

问题 I use winforms and c#. How can I filter Binding source or binding list. with a textbox text ? I meam while I am typing in a textbox my grid is filtering with a %Like method not (=,equal)method. thanks. 回答1: I use delegate for this problem. Some code like bellow _List = _List.FindAll( delegate(MyEntity entity) { return entity.Title.Contains(TXT_Title.Text); } ); Gview.DataSource = _List ; 回答2: You may want to use CollectionViewSource class to enable filtering. See here 来源： https:/

问题 Goal: Once clicking on add or delete button, the datagridview should be refreshed with the latest data from document. Problem: The datagridview can't be refreshed after making changes by deleting or adding new data. I'm using binding source that is linked with datagridview's datasource. I tried everything with different solution and read advise from different forum but still I can't solve this problem. I also tried using these syntax "BindingSource.ResetBindings(false)", "BindingSource

问题 I currently have a DataGridView on a form which I want to use with a DataTable in a DataSet, populated from a SQlite database (using System.Data.SQlite). So, I have a DataAdapter between the database and DataSet and can set the DataGridView data source directly as the DataTable. This displays fine. My question is this: Why would I want to use a Binding Source here? Many tutorials have said you can use it or not. But is there any use for it, other than adding an extra step? Also, if I want the