Guid Datatype in LIghtSwitch 2012

Here we will see how to use the Guid Datatype in LightSwitch Visual Studio 2012.

The following table shows the various format patterns for the Guid Datatype.

Format

Description

Displayed Result

      N Displays 32 characters. 3261a3cfc18f4747b957e5264b6a430c
      D Displays 32 characters separated by hyphens. 3261a3cf-c18f-4747-b957-e5264b6a430c
      B Displays 32 characters separated by hyphens and enclosed in braces. {3261a3cf-c18f-4747-b957-e5264b6a430c }
      P Displays 32 characters separated by hyphens and enclosed in parentheses. (3261a3cf-c18f-4747-b957-e5264b6a430c)
      X Displays four hexadecimal values enclosed in braces, where the fourth value is a subset of eight hexadecimal values enclosed in another set of braces. {0x3261a3cf,0xc18f,0x4747,{0xb0,0x57,0xe5,0x26,0x4b,0x6a,0x43,0x0c}}

The following is the procedure to create a sample using the Guid datatype in LightSwitch.

Step 1

Open the LightSwitch Application in Visual Studio 2012 and go to the Solution Explorer.

Solution Explorer

Right-click on Data Sources and choose "Add Table".

Add Table

Step 2

The table appears in the table designer window. Insert the records in the following table.

Student Table

Here in the table I have added a record named "BookletCode" and I have taken its datatype as "Guid" as shown below.

Select record of Guid Data Type

Select the "BookletCode" record from the table and then go to the property window.

Format Pattern in Property Window

In the property window, write "N" for the format in the TextBox
under Format Pattern as shown below.

Write N Pattern in Textbox

Step 3

Now once again go to the Solution Explorer, right-click on Screens and choose "Add Screen".

Add Screen

The Add New Screen dialog box appears. Select the "Editable Grid Screen" from the Screen Template, inside screen information, choose "Student" under screen data and provide some name to the Screen and click the OK button.

Add New Screen

The Screen Designer appears. However you change the Label Position as well as text alignment from the property window.

Application Designer

Step 3

Press F5 to run the application. Note that the Bookletcode field displays 32 characters by default.

Output using N format in Guid

Step 4

Stop debugging the application.

Once again go to the Property window of "BookletCode" in the table and enter "D" in the Format Pattern TextBox as shown below.

Property using D format Pattern

Once again press F5 to run the application. It will
display 32 characters separated by hyphens as shown in the following output.

Output using D format pattern

Step 5

Stop debugging the appliaction and once again go to the property window of the table and this time enter "X" in the format pattern TextBox as shown below.

Using X format pattern in property

Press F5 to run the application we will get the BookletCode output in the following format.

output using X format pattern