Workflow extension step 2-Use the [lower]-wf4.0 for activities in a set group

Opening

In the previous article, we mainly talked about how to use the collection activity to design and develop a workflow in step 1 of workflow extension-[previous]-wf4.0 for activities in the collection group. In this article, we will continue

Describes the usage of the other two activities in a collection activity.

Summary

In this article, we are the second extension article. This article mainly describes the usage of collection. Generally, we operate collections in the following ways: add, delete, and query, therefore, WF provides the following four types by default.

Collection activities:

Specifically, I think we can literally tell you a story. Let's take a look at the specific usage details.

Finally, let's sort out a process and integrate all the activities of these four sets into a process.

Outline

1. Opening

2. Summary

3. Outline

4. Usage of collection activities [II]

Set usage [lower] 1. existsincollection <t> Activity

1. Create a console project:

2. Add the corresponding node to the designer:

Initialization variable information:

3. refer to the previous articleArticleAbout addtocollection <t> activity settings, the above activity settings are identical, after the settings are complete, as follows:

4. Add an existsincollection activity under the addtocollection activity:

5. Next we will add other writeline activities to help us test the output results:

6. Run F5 and check the result to see if the result is consistent with our expectation:

The above describes the existsincollection <t> activity. The usage of other activities is similar.

Next let's take a look at the removefromcollection usage. The main function of this activity is to remove the specified item from the set.

2. removefromcollection <t> Activity

The specific function of removefromcollection is to remove the specified items in the specific target set. The specific usage is as follows:

1. Create an activity file, drag a sequence and addtocollection, and add a removefromcollection activity:

2. Add a removefromcollection <t> activity under the addtocollection activity. The properties of the activity are as follows:

3. Next, we will add several writeline activities to identify the start and end of the WF process, and record the specific content of each operation as follows:

The above content is a bit large, so I split it, but the above images are complete together. If you cannot understand it, please referCodeRight:

4. Run F5 and check the specific running result to see if we want it. What is the output result of the set after the removefromcollection activity is completed?

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