How to create an RPA Flow using Invoke Method activity with System.Xml.XmlDocument

1

Open RPA Studio

Open RPA Studio on your machine, and sign in, if required.

2

Create a new project

On the Home page click Create New Project and specify the following properties in the pop up window:

1. Name: InvokeMethodExample
2. ProjectLocation: <default>
3. Description: Demo on the Invok

3

Start building the Sequence

First, we will read the XML file into a string using the Read Text File activity. You can find the list of activities by clicking Activities in the left-hand side bar or from the View menu in the top bar. Use search to find the activity you want.

Configure the activity in the following way:

1. Source FilePath: Set this to the path of your XML file (e.g., “C:\RPA\Example.xml”).
2. Text: To store the content of the xml file, let’s create a variable for the Text property. We’ll call it xmlContent, the Variable type is string.

4

Add and Configure Assign Activity

Next, we will create an xmlDocument object using the Assign activity, which should be configured in the following way:

1. Create a variable to store the result for To property. Name it xmlDoc and choose the type System.XML.XMLDocument (Variable type/Browse for Types).
2. Go back to the Assign activity and add the variable xmlDoc to To property.
3. Value: New System.Xml.XmlDocument()
4. This makes the eExpression: xmlDoc = New System.Xml.XmlDocument().

5

Add and configure the Invoke Method Activit

We will now load the XML content into the xmlDocument using the Invoke Method activity, which should be configured in the following way:

1. Target Object: Set this to xmlDoc (the XmlDocument object).
2. Method Name: We will call this LoadXML as we are loading the XML content.
3. Set the Parameters by clicking the “…” and configure in a following way:
4. Direction: In.
5. Type: String.
6. Value: Set this to xmlContent (the string containing the XML content from step 1).

6

Add and configure the second Invoke Method

To find the element with id="1", we will use XPath via the SelectSingleNode method, which should be configured in the following way using the Invoke Method activity:

1. Target Object: Set this to xmlDoc.
2. Method Name: Use SelectSingleNode to search for the node.
3. Parameters:

• Direction: In.
• Type: String.
• Value: Set this to the XPath expression "/Root/Element[@id='1']"

4. Result: Store the result from the invoke method meaning the value of the node, for that we need to create the variable called selectedNode of type: Systen.XML.XmlNode.

7

Add and configure the 3rd Invoke Method

Finally, we will extract the inner text (value) of the selected node using another Invoke Method activity. Create the required variable and fill in the InvokeMethod according to the image:

8

Finish the flow

You can output the results using Message Box activity. Add nodeValue Variable to Input Text.

Save your flow and Click Run to execute and verify that the output displays the value “Value1”.