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csharp key press event tutorial and app.config

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Guide

MainForm

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protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
       {
           //System.Console.WriteLine("ProcessCmdKey " + cur_image_id);

           //capture up arrow key
           if (keyData == Keys.Left)
           {
               //this.button_prev.PerformClick();
               button_prev_click();

               return true;
           }
           else if (keyData == Keys.Right)
           {
               //System.Console.WriteLine("Enter "+cur_image_id);

               //this.button_ok.PerformClick();
               button_ok_click();

               return true;
           }
           
           return base.ProcessCmdKey(ref msg, keyData); // trigger 2 button_ok_click
       }

TextBox

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private void textBox_index_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                //enter key is down
                button_goto_click();
            }
        }

app.config

app.config.xml

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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
    </startup>
    <appSettings>
      <add key="image_extension" value="png" />
      <add key="output_filepath" value="./output.json" />
    </appSettings>
</configuration>

usage

reference System.Configuration.dll

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using System.Configuration;

private void init_config()
        {
            var appSettings = System.Configuration.ConfigurationManager.AppSettings;
            string image_ext = "*."+ appSettings["image_extension"];
            string output_filepath = appSettings["output_filepath"];
        }

Reference

History

  • 20190919: created.