Dev series -- treelist usage, Kafka interview questions sorting

mb61ab431c11928 2022-01-26 12:50:08 阅读数:542

dev series treelist usage kafka

DEV series --treeList usage ,kafka Arrange interview questions

Source code :

<span style="font-size:24px;">using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Linq;

using System.Windows.Forms;

using DevExpress.XtraEditors;

using System.Data.SqlClient;

using DevExpress.XtraTreeList.Nodes;

namespace lianxi


public partial class treelist_shijian : DevExpress.XtraEditors.XtraForm


public treelist_shijian()





// Bind the read database to treeList1 in

public void ShuJu()


SqlConnection conn = new SqlConnection("server=(local);database=DEV_Test;Integrated Security=true;");

SqlCommand comm = new SqlCommand("select from Table_treelist", conn);//select Write later “” Otherwise, the effect of tree structure will not come out


SqlDataReader reader = comm.ExecuteReader();

DataTable dt = new DataTable();


this.treeList1.DataSource = dt;

this.treeList1.KeyFieldName = " Number ";

treeList1.ParentFieldName = " Parent class number ";

treeList1.Columns[0].Caption = " company ";


// Show check boxes

treeList1.OptionsView.ShowCheckBoxes = true;


// When selecting a node , Select all the child nodes of this node When canceling a node , All child nodes of this node are deselected

private void SetCheckedChildNodes(TreeListNode node, CheckState check)


for (int i = 0; i < node.Nodes.Count; i++)


node.Nodes[i].CheckState = check;

SetCheckedChildNodes(node.Nodes[i], check);



// When all the child nodes of a node are selected , Select... For this node When not all the child nodes of a node are selected , This node does not select

private void SetCheckedParentNodes(TreeListNode node, CheckState check)


if (node.ParentNode != null)


CheckState parentCheckState = node.ParentNode.CheckState;

CheckState nodeCheckState;

for (int i = 0; i < node.ParentNode.Nodes.Count; i++)


nodeCheckState = (CheckState)node.ParentNode.Nodes[i].CheckState;

if (!check.Equals(nodeCheckState))// As long as any one is different from its selected status, that is, the parent node status is not all selected


parentCheckState = CheckState.Unchecked;



parentCheckState = check;// otherwise ( The sibling nodes of this node are all selected in the same status ), The selected status of the parent node is the selected status of the node


node.ParentNode.CheckState = parentCheckState;

SetCheckedParentNodes(node.ParentNode, check);// Traverse the parent node



// Trigger the select node event

private void treeList1_AfterCheckNode(object sender, DevExpress.XtraTreeList.NodeEventArgs e)


SetCheckedChildNodes(e.Node, e.Node.CheckState);

SetCheckedParentNodes(e.Node, e.Node.CheckState);

Kafka Practical notes

About this note , In order not to affect everyone's reading experience , I can only show some chapters and core screenshots in the article


  • Kafka introduction
  • Why choose Kafka
  • Karka Installation 、 Management and configuration


  • Kafka The cluster of
  • first Kafka Program
  • image.png

afka The producers of


  • Kafka The consumer
  • In depth understanding of Kafka
  • Reliable data transmission



  • Spring and Kalka Integration of
  • Sprinboot and Kafka Integration of
  • Kafka The practice of cutting peaks and filling valleys
  • Data pipeline and streaming ( Understanding can )


  • Kafka The practice of cutting peaks and filling valleys


This article has been  CODING Open source project :【 A big factory Java Analysis of interview questions + Core summary learning notes + The latest explanation video + Actual project source code 】 Included

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