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In most cases, however, this information has little value because it doesn t ensure that the pro tected resource can be accessed. The IsGranted method is more useful when applied to iden tity permissions, as I ll explain in the Identity Permission Classes section later in this chapter.

When you are calling an assembly that you haven t authored yourself and don t trust completely, it is a good idea to reduce the permission set for that assembly. For exam ple, let s say you are calling an assembly that should be prevented from doing anything but displaying user interface elements. You can enforce this security rule by invoking the PermitOnly method of the UIPermission object:

Now that you can display pictures, you can improve your Color Nerve game and display a picture rather than a blank background. This makes the game much more fun, especially if a familiar picture is used.

Dim uiPerm As New UIPermission(PermissionState.Unrestricted)

1. Select the image. Then on the Picture toolbar, click the Compress Pictures button. 2. In the Compress Pictures dialog box, set the compression options, target output,

uiPerm.PermitOnly()

CodeAccessPermission.RevertPermitOnly()

In most cases, you don t need to explicitly call the RevertPermitOnly shared method of the CodeAccessPermission class to undo the effect of the PermitOnly method because the permission object will be removed from the stack when the current procedure ter minates. However, the RevertPermitOnly method is mandatory if you plan to invoke the PermitOnly method on a different permission from inside the same procedure because only one PermitOnly method can be active at a given time:

The key to this is the way that you select the color you want to use to light any sprite that you draw:

Part VII:

Dim uiPerm As New UIPermission(PermissionState.Unrestricted)

dialog box, change the Color setting under Fill to what you want, and change any other settings you want. Then select the Apply settings to new AutoShapes check box, and click OK.

uiPerm.PermitOnly()

Dim regPerm As New RegistryPermission(PermissionState.Unrestricted)

spriteBatch.Draw(jakeTexture, jakeRect, Color.White);

regPerm.PermitOnly()

The Deny method is similar to the PermitOnly method in that it reduces the permission granted to the assemblies your code calls. The Deny method tells the .NET runtime that a specific permission object isn t granted. Its effect can be undone with the RevertDeny shared method of the CodeAccessPermission class:

Dim uiPerm As New UIPermission(PermissionState.Unrestricted)

line from the shape to another shape. To group shapes or design elements, page 56 Select the items you want to group by holding down the G key as you click each one in turn. Then on the Arrange menu, click Group. To ungroup shapes or design elements, page 56 Click the grouped object, and then click the Ungroup Objects button that appears.

uiPerm.Deny()

CodeAccessPermission.RevertDeny()

When drawing this image, I used a white light so that the colors look natural. You can use any color of light, and XNA processes the image accordingly. If you want the image to be drawn more dimly, you can draw with the color gray; if you want to tint the image, you can simply change the color. You can use any color that you can create to tint your sprite, as follows:

In general, however, the Deny method is less useful than the PermitOnly method because it s easier to enumerate the permission objects that an assembly needs than those that the assembly doesn t need.