Devexpress Gridview Edirform Desiger Required
Using TemplateFields in the GridView Control (C#). 17 minutes to read. Contributors.In this articlebyorTo provide flexibility, the GridView offers the TemplateField, which renders using a template. A template can include a mix of static HTML, Web controls, and databinding syntax.
In this tutorial we'll examine how to use the TemplateField to achieve a greater degree of customization with the GridView control. IntroductionThe GridView is composed of a set of fields that indicate what properties from the DataSource are to be included in the rendered output along with how the data will be displayed. The simplest field type is the BoundField, which displays a data value as text. Other field types display the data using alternate HTML elements. The CheckBoxField, for example, renders as a checkbox whose checked state depends on the value of a specified data field; the ImageField renders an image whose image source is based upon a specified data field.
Hyperlinks and buttons whose state depends on an underlying data field value can be rendered using the HyperLinkField and ButtonField field types.While the CheckBoxField, ImageField, HyperLinkField, and ButtonField field types allow for an alternate view of the data, they still are fairly limited with respect to formatting. A CheckBoxField can only display a single checkbox, whereas an ImageField can only display a single image. What if a particular field needs to display some text, a checkbox, and an image, all based upon different data field values? Or what if we wanted to display the data using a Web control other than the CheckBox, Image, HyperLink, or Button? Furthermore, the BoundField limits its display to a single data field. What if we wanted to show two or more data field values in a single GridView column?To accommodate this level of flexibility the GridView offers the TemplateField, which renders using a template. A template can include a mix of static HTML, Web controls, and databinding syntax.
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Furthermore, the TemplateField has a variety of templates that can be used to customize the rendering for different situations. For example, the ItemTemplate is used by default to render the cell for each row, but the EditItemTemplate template can be used to customize the interface when editing data.In this tutorial we'll examine how to use the TemplateField to achieve a greater degree of customization with the GridView control. In the we saw how to customize the formatting based on the underlying data using the DataBound and RowDataBound event handlers. Another way to customize the formatting based on the underlying data is by calling formatting methods from within a template. We'll look at this technique in this tutorial as well.For this tutorial we will use TemplateFields to customize the appearance of a list of employees. NoteThe DataBindings dialog box allows you to indicate whether to perform two-way databinding. If you leave this unchecked, the databinding syntax <%# Eval('LastName')% will be used instead of <%# Bind('LastName')%.
Either approach is fine for this tutorial. Two-way databinding becomes important when inserting and editing data. For simply displaying data, however, either approach will work equally well. We'll discuss two-way databinding in detail in future tutorials.Take a moment to view this page through a browser.
Devexpress Gridview Edirform Desiger Required 1
As you can see, the GridView still includes four columns; however, the FirstName column now lists both the FirstName and LastName data field values.Figure 9: Both the FirstName and LastName Values are Shown in a Single Column To complete this first step, remove the LastName BoundField and rename the FirstName TemplateField's HeaderText property to 'Name'. After these changes the GridView's declarative markup should look like the following: Figure 10: Each Employee's First and Last Names are Displayed in One Column Step 3: Using the Calendar Control to Display the HiredDateFieldDisplaying a data field value as text in a GridView is as simple as using a BoundField. For certain scenarios, however, the data is best expressed using a particular Web control instead of just text. Such customization of the display of data is possible with TemplateFields.
Devexpress Gridview Add Column
For example, rather than display the employee's hire date as text, we could show a calendar (using ) with their hire date highlighted.To accomplish this, start by converting the HiredDate BoundField into a TemplateField. Simply go to the GridView's smart tag and click the Edit Columns link, bringing up the Fields dialog box. Select the HiredDate BoundField and click 'Convert this field into a TemplateField.' Figure 11: Convert the HiredDate BoundField Into a TemplateField As we saw in Step 2, this will replace the BoundField with a TemplateField that contains an ItemTemplate and EditItemTemplate with a Label and TextBox whose Text properties are bound to the HiredDate value using the databinding syntax <%# Bind('HiredDate')%.To replace the text with a Calendar control, edit the template by removing the Label and adding a Calendar control. From the Designer, select Edit Templates from the GridView's smart tag and choose the HireDate TemplateField's ItemTemplate from the drop-down list.
Next, delete the Label control and drag a Calendar control from the Toolbox into the template editing interface.Figure 12: Add a Calendar Control to the HireDate TemplateField's ItemTemplate At this point each row in the GridView will contain a Calendar control in its HiredDate TemplateField. However, the employee's actual HiredDate value is not set anywhere in the Calendar control, causing each Calendar control to default to showing the current month and date. To remedy this, we need to assign each employee's HiredDate to the Calendar control's and properties.From the Calendar control's smart tag, choose Edit DataBindings. Next, bind both SelectedDate and VisibleDate properties to the HiredDate data field.Figure 13: Bind the SelectedDate and VisibleDate Properties to the HiredDate Data Field. NoteThe Calendar control's selected date need not necessarily be visible. For example, a Calendar may have August 1 st, 1999 as the selected date, but be showing the current month and year. The selected date and visible date are specified by the Calendar control's SelectedDate and VisibleDate properties.
Since we want to both select the employee's HiredDate and make sure that it's shown we need to bind both of these properties to the HireDate data field.When viewing the page in a browser, the calendar now shows the month of the employee's hired date and selects that particular date.Figure 14: The Employee's HiredDate is Shown in the Calendar Control. NoteAlternatively, instead of passing in an EmployeesRow instance, we could just pass in the HireDate value using <%# DisplayDaysOnJob(Eval('HireDate'))%. However, the Eval method returns an object, so we'd have to change our DisplayDaysOnJob method signature to accept an input parameter of type object, instead. We can't blindly cast the Eval('HireDate') call to a DateTime because the HireDate column in the Employees table can contain NULL values. Therefore, we'd need to accept an object as the input parameter for the DisplayDaysOnJob method, check to see if it had a database NULL value (which can be accomplished using Convert.IsDBNull(objectToCheck)), and then proceed accordingly.Due to these subtleties, I've opted to pass in the entire EmployeesRow instance.
Files to look at:. (VB: ). (VB: ).GridView - How to use GridLookup in EditForm in multiple selection modeStarting with v15.1, GridLookup can be automatically bound to a model field that returns an array of values (see )This example illustrates how to use GridLookup in a multiple selection mode ( is ) as a GridView editor. The main idea is to use the method to place GridLookup in EditForm. The same approach will work for a custom EditForm as well.Note that prior to version 16.1.6, the GridLookupExtension.Bind method doesn't automatically select required keys. It's necessary to assign a delegate method to the PreRender property to manually select the values using the method. Starting with version 16.1.6, it is sufficient to pass values to bind/select to the GridLookupExtension.Bind method.