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That was simple enough. Let s look at something a little more complex. It is possible to specify that you don t care what the parents are by prefixing with a double forward slash (//). For example, //Name would get you all Name nodes in the document. Be careful, though: If you use the Name element start tag in different places, you will get them all. Along the same lines, if you don t actually care what the parent is but you want only a node at a specific depth, you would use the asterisk (*) to match any element. For example, /MonsterList/*/Name would get all the names with a grandparent of MonsterList, but it would matter who the parent was. Conditional expressions are possible. You enclose conditionals in square brackets ([]). For example, //Monster[Name] would result in all monsters that have the Name node (which would be all of them, as Name is a mandatory element but that is another story). It is possible to specify an exact value for the conditional node or specify what values it cannot be. For example, //Monster[Name = ''Goblin''] //Monster[Name != ''Succubus''] would result in the first expression grabbing the Monster node Goblin and the second expression grabbing every monster but the Succubus. Here is a method that will execute a combination of a few of the expressions you covered previously. Also notice that just to be different, the example uses the XmlNode class s SelectNodes() method. Because XmlNodes don t concatenate child values, you need to navigate to the child to get the desired value: void GetDragonsWeapons(XmlNode ^node) { XmlNodeList ^list = node->SelectNodes("//Monster[Name='Red Dragon']/Weapon"); Console::WriteLine("\nDragon's Weapons\n-------"); IEnumerator ^en = list->GetEnumerator(); while (en->MoveNext()) { XmlNode ^n = (XmlNode^)en->Current; Console::WriteLine(n->FirstChild->Value); } } Figure 13-10 shows the output of the snippet.

Another approach would be to handle key presses in the text box to prevent invalid input altogether or to use data binding validation, as discussed later in this chapter The changes you make in the text box aren t applied until the text box loses focus (for example, when you tab to another control) If this isn t the behavior you want, you can get an instantaneous refresh using the UpdateSourceTrigger property of the Binding object, as you ll learn shortly in the Binding Updates section Interestingly, the solution shown here isn t the only way to connect the text box It s just as reasonable to configure the text box so that it changes the SliderValue property instead of the TextBlock.

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Let s expand on this expression just a little more. It is also possible to have conditionals with logical operators such as and, or, and not(). The following method shows the logical operator in practice. It also shows how to grab an attribute value out of the navigator: void GetGoblinSuccubusHitDice(XPathNavigator ^nav) { XPathNodeIterator ^list = nav->Select("//Monster[Name='Goblin' or Name='Succubus']/HitDice"); Console::WriteLine("\nGoblin & Succubus HD\n-----------"); while (list->MoveNext()) { XPathNavigator ^n = list->Current; n->MoveToFirstAttribute(); Console::WriteLine(n->Value); } } Figure 13-11 shows the output of the snippet.

Figure 3-27. Resolve Conflict dialog box Path shows the location of the local file, which is different from that on the server. Changes indicates how many changes are different in each file and how many are conflicting. Resolution options are described in Table 3-3. Table 3-3. Resolution Options

FontSize property: <TextBox Text="{Binding ElementName=sliderFontSize, Path=Value, Mode=TwoWay}"> </TextBox> Now changing the text box triggers a change in the slider, which then applies the new font to the text Once again, this approach works only if you use two-way data binding And lastly, you can swap the roles of the slider and text box so that the slider binds to the text box To do this, you need to create an unbound TextBox and give it a name: <TextBox Name="txtFontSize" Text="10"> </TextBox> Then you can bind the SliderValue property, as shown here: <Slider Name="sliderFontSize" Margin="3" Minimum="1" Maximum="40" Value="{Binding ElementName=txtFontSize, Path=Text, Mode=TwoWay}" TickFrequency="1" TickPlacement="TopLeft"> </Slider> Now the slider is in control When the window is first shown, it retrieves the TextBoxText property and uses that to set its Value property When the user drags the slider thumb to a new position, it uses the binding to update the text box.

Figure 13-11. Output for the XPath expression //Monster[Name='Goblin' or Name='Succubus']/HitDice To match attributes in an XPath expression, use the at sign (@) in front of the attribute s name. For example, void GetGoblinSuccubusHitDice(XPathNavigator ^nav) { XPathNodeIterator ^list = nav->Select("//Monster[Name='Goblin' or Name='Succubus']/HitDice/@Dice"); Console::WriteLine("\nGoblin & Succubus HD\n----------"); while (list->MoveNext()) { XPathNavigator ^n = list->Current; Console::WriteLine(n->Value); } } results in the same output as the previous example. Notice that you no longer have to move to the attribute before displaying it. As a final example, the following snippet shows that you can make numeric comparisons. In this example, I grab all Weapon elements with a Number attribute of less than or equal to 1:

Or, the user can update the slider value (and the font size of the sample text) by typing in the text box..

Attempts to merge the files automatically. Same as the Auto Merge option. Allows the developer to manually work through the files to choose the correct lines to merge. Discards the local changes, does not check in the file, retrieves the server version to the local workspace. Overwrites the changes on the server with the changes from the local file.

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