使用 C# 从 SQL 数据库动态填充树视图

Question

Please help me to populate a tree view from SQL database dynamically. I am very new to C# and step by step processes are welcome. I have two table formats given in the picture below and I want to fill the tree view from database accordingly. I searched on other resource sites also but didn't find the solution what I am looking for.

Please Help !!

Please view given image,

enter image description here

Answer 1

I suppose you have two choices

You either run a JOIN which will create a result from the db where the department name is repeated over and over, and the sub department name is unique; you then loop over this result set row by row with a logic of:

• try and retrieve the tree node with the department name X
• if it failed because there was no tree node X add a new tree node X to the children of the root node
• now there certainly is a node for department X, either new or already existing: add the child sub department to the node

---

Or, you run two loops

• Query the departments and start a loop over the results
• create a node for the current department row
• query the database for the sub departments of this current department
• start another loop that adds the sub departments just queries as children of the current department node

---

In either case you'll need to query a db, so get that part working. Entity Framework will help if you want to use it

Also, look into adding nodes to a tree view and get familiar with it - don't need a db for this, just code it up by hand manually adding nodes for practice