datagridviewcolumn | 易学教程

How to enable NULL value selection in DataGridview CalendarColumn

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问题 I have a DataGridView CalendarColumn. By default, if the column its bound to in the database table is NULL, its shows the current, but i have a requirements to make it just NULL as well. For example if the data for that particular date column, i want a user to be able to just make the Date Cell empty(NULL) but i cant find a property to set to achieve this. Any ideas, is to possible to achieve this kind of behaviour in a Datagridview's Calendercolumn 回答1: public object

DataGridView autoComplete comboBox column not retaining values on initial cell leave

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问题 I have a bound dataGridView with an autoComplete combobox column and the autocomplete is working except that am observing one behaviour thats abit irritating. When i type text in the autocomplete cell for the first time and move to the next cell with the tabKey, my selection is not retained, what ever i selected is cleared and the autocomplete cell is left null. If ii immediately use the left arrow key to return to that autocomplete cell and type in text, what ever i select is retained with

DataGridView resizeable columns, but last column can't be resized bigger?

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问题 For c = 0 To grd.Columns.Count - 1 grd.Columns(c).Resizable = DataGridViewTriState.True Next c That allows all the columns in my DataGridView to be resizable EXCEPT the last column. Why? I DO get the little resizable-mouse-pointer... but you can only make the column SMALLER , never WIDER . (Same problem if I try to set all the columns to Resizable, using the VB.net IDE) What am I doing wrong here? Shouldn't I be able to resize ANY column I want, bigger or smaller? 回答1: You can't make the last

Windows Forms: Cell Wrapping mode to display adaptive ellipsis

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问题 I'm using a Windows Forms Datagridview to diplay some (long) text. (The code is PowerShell, but the problem is related to the Cell Wrapping mode) $TestGridView = New-Object System.Windows.Forms.DataGridView -Property @{ Name="TestDataGridView" AllowUserToAddRows = $False AllowUserToDeleteRows = $False Location = "14,225" Size = "1041,328" TabIndex = 1 DefaultCellStyle= @{WrapMode ='True'} RowHeadersVisible=$False AutoSizeColumnsMode='Fill' AutoSizeRowsMode = 'AllCells' Anchor = 'Left, Right,

C# - How to pass the data from dataGridView1 to another using a button click?

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问题 I have a dataGridView1 , dataGridView2 and a ButtonAdd in one Form. The user will: 1- select any one "Cell" or the "entire Row". 2-select multiple Rows Then: the data selected will be moved from dataGridView1 to dataGridView2 when the button clicked. that's all what i need to do. My try: I have tried this solution after many searches and it's almost done but there's a little problem I couldn't handle: Full Code: private const string strconneciton = @"YourConnectionString"; SqlConnection con =

How to remove sorting glyph in datagridview without removing Sorting facility

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问题 How can i remove sorting glyph from column headers in DataGridView without removing its sorting functionality. I am working on windows form application in C#, i want to generate report from a datagridview, where datagridview column width will assign in report column, where as the DataGridView column include the with of sorting glyph, that is unnecessary space in my case, i want to exclude it from ColumnHeader. 回答1: This is actually quite easy to do using custom cell painting. All you need to

How to Change Format column in Datagridview to date type for this value

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问题 For example, I have a value like this : 41607.2069444444; 41607.2068402778; 41607.2072222222; this is calculation of dateTimeOrigination from CDR, in excel where i change the format cell to type date, its work and this is 11/29/2013 4:58:42 AM. My questions is how to format this value to date in datagridview in VB.net? 回答1: Try like this: MyDatagridview.Columns(4).DefaultCellStyle.Format = "dd.MM.yyyy HH:mm:ss" In my case the 5th column (Remember that Datagridview.Columns are zero-based) is

Windows Forms: Cell Wrapping mode to display adaptive ellipsis

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I'm using a Windows Forms Datagridview to diplay some (long) text. (The code is PowerShell, but the problem is related to the Cell Wrapping mode) $TestGridView = New-Object System.Windows.Forms.DataGridView -Property @{ Name="TestDataGridView" AllowUserToAddRows = $False AllowUserToDeleteRows = $False Location = "14,225" Size = "1041,328" TabIndex = 1 DefaultCellStyle= @{WrapMode ='True'} RowHeadersVisible=$False AutoSizeColumnsMode='Fill' AutoSizeRowsMode = 'AllCells' Anchor = 'Left, Right, Top, Bottom' DefaultCellStyle.Padding = new-object Windows.Forms.Padding -a 2 } I'm using Cell Wrapping

How to make custom DataGridViewComboBox dependent only on its DataGridViewComboBoxColumn?

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Popular way ( 1 , 2 ) for custom painting of items in DataGridViewComboBox is handling of event DataGridView1. EditingControlShowing and setting up DrawItem event handlers there: private void dataGridView1_EditingControlShowing( object sender, DataGridViewEditingControlShowingEventArgs e) { theBoxCell = (ComboBox) e.Control; theBoxCell.DrawItem += theBoxCell_DrawItem; theBoxCell.DrawMode = DrawMode.OwnerDrawVariable; } You see what is wrong: it uses control-level event to handle work for columns. But what if I have 50+ datagridviews? Painting of custom combo boxes should be handled per column

C# - How to pass the data from dataGridView1 to another using a button click?

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I have a dataGridView1 , dataGridView2 and a ButtonAdd in one Form. The user will: 1- select any one "Cell" or the "entire Row". 2-select multiple Rows Then: the data selected will be moved from dataGridView1 to dataGridView2 when the button clicked. that's all what i need to do. My try: I have tried this solution after many searches and it's almost done but there's a little problem I couldn't handle: Full Code: private const string strconneciton = @"YourConnectionString"; SqlConnection con = new SqlConnection(strconneciton); SqlCommand cmd = new SqlCommand(); DataTable dataTable; private void