vb.net-2010

问题 Once I have divided the tasks to 4 independent tasks and make them run in parallel. Is it possible to further make each task run in parallel ? (says, each task, there are lots of for each loop - that could be implemented as parallel code) 回答1: You definitely could, but it doesn't guarantee thread safety. You have to take into account multiple factors though What's the size of your iterations (The more, the better) How many concurrent threads can your CPU handle The amount of cores in your

问题 I am trying to bind this dictionary collection to a combobox but the display is not correct. The displayMember should be the ProvName and the ValueMember should be the key. Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click Dim Country1 As Dictionary(Of String, Province) Country1 = Module1.CreateCountry 'Display results in combox ComboBox3.DataSource = New BindingSource(Country1, Nothing) ComboBox2.DisplayMember = "Value" ComboBox2.ValueMember = "Key" End Sub

问题 I am trying to bind this dictionary collection to a combobox but the display is not correct. The displayMember should be the ProvName and the ValueMember should be the key. Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click Dim Country1 As Dictionary(Of String, Province) Country1 = Module1.CreateCountry 'Display results in combox ComboBox3.DataSource = New BindingSource(Country1, Nothing) ComboBox2.DisplayMember = "Value" ComboBox2.ValueMember = "Key" End Sub

问题 I'm trying to help a friend - they have a pretty big web application (ASP.NET 4.0, Visual Basic) that has a number of subfolders that all act as quasi sub-applications (but they're just subfolders of the main application). This application will be split up into multiple independent web application because in its current form it's hard to maintain and develop any further. The problem is that the current monolithic application uses a number of session variables for things like user information

问题 I'm trying to help a friend - they have a pretty big web application (ASP.NET 4.0, Visual Basic) that has a number of subfolders that all act as quasi sub-applications (but they're just subfolders of the main application). This application will be split up into multiple independent web application because in its current form it's hard to maintain and develop any further. The problem is that the current monolithic application uses a number of session variables for things like user information

问题 I am currently making a program in vb.net. it has lots of Text box inside of it. how do i clear them using for each loop. I have here my code but nothing happens in my program, my text boxes still have data. For Each txt As TextBox In personalInfo.Controls txt.Enabled = False Next by the way i have three group boxes with text boxes how do i clear all of text boxes with this code. 回答1: Use txt.Clear(); for clearing a TextBox. Are you sure that all controls in personalInfo are TextBoxes? If not

问题 I've been struggling with this for a while now, trying all sorts of things to get this to work. It's my understanding that SetupDiGetDeviceInterfaceDetail is supposed to give the 1784 error the first time around because the sole purpose of calling it the first time is to get RequiredSize set to the right value. The second time it's called, it's supposed to actually work and give me a valid DeviceInterfaceDetailData structure. I'm not sure what is causing this to fail on the second call.

问题 I am working with a DataGridView for the first time and while I have MANY questions, this latest issue is vexing me. Summary of issue: I have a DataGridView (dgv) which I have a set of columns defined. Some readonly some editable. For the editable columns I need four things to occur. 1) Allow Numeric entry 2) Allow maximum of 2 digits 3) Zero Pad any entries <2 digits 4) My ISSUE: If the user types in a two digit number, I want to detect that and TAB to the next column. I cannot get this to

问题 I am working with a DataGridView for the first time and while I have MANY questions, this latest issue is vexing me. Summary of issue: I have a DataGridView (dgv) which I have a set of columns defined. Some readonly some editable. For the editable columns I need four things to occur. 1) Allow Numeric entry 2) Allow maximum of 2 digits 3) Zero Pad any entries <2 digits 4) My ISSUE: If the user types in a two digit number, I want to detect that and TAB to the next column. I cannot get this to

问题 I have a problem in query data from database to make report in VB.NET. I use the Business Object to do the report. And here is my example data: ___________________________________________________________________________ | | | | | | | | Id | Item | Unit | Unit Price | Quantity | Amount | |____|_______________|__________|_____________|___________|_______________| | 1 | Gasoline | L | $ 2.00 | 10 | $ 20.00 | | 1 | Gasoline | L | $ 2.50 | 20 | $ 50.00 | | 2 | Water | Bottle | $ 5.00 | 10 | $ 50