User Defined Function Example

Code:

using System;
using System.Drawing;
using System.Windows.Forms;

namespace User_Defined_Function_Example {

  public partial class FormMaster : EZ_Builder.UCForms.FormPluginMaster {

    public FormMaster() {

      InitializeComponent();
    }

    private void FormMaster_Load(object sender, EventArgs e) {

      // Intercept all unknown functions called from any  EZ-Script globally.
      // If a function is called that doesn't exist in the  EZ-Script library, this event will execute
      ExpressionEvaluation.FunctionEval.AdditionalFunctionEvent += FunctionEval_AdditionalFunctionEvent;
    }

    private void FormMaster_FormClosing(object sender, FormClosingEventArgs e) {

      // Disconnect from the function event
      ExpressionEvaluation.FunctionEval.AdditionalFunctionEvent -= FunctionEval_AdditionalFunctionEvent;
    }

    /// 
    /// This is executed when a function is specified in any ez-scripting that isn't a native function.
    /// You can check to see if the function that was called is your function.
    /// If it is, do something and return something.
    /// If you don't return something, a default value of TRUE is returned.
    /// If you throw an exception, the  EZ-Script control will receive the exception and present the error to the user.
    /// 
    private void FunctionEval_AdditionalFunctionEvent(object sender, ExpressionEvaluation.AdditionalFunctionEventArgs e) {

      // Check if the function is our function (SetColor)
      if (!e.Name.Equals("setcolor", StringComparison.InvariantCultureIgnoreCase))
        return;

      // Check if the correct number of parameters were passed to this function
      if (e.Parameters.Length != 3)
        throw new Exception("Expects 3 parameters. Usage: SetColor(red [0-255], green [0-255], blue [0-255]). Example: SetColor(20, 200,100)");

      // Convert the parameters to datatypes
      byte red = Convert.ToByte(e.Parameters[0]);
      byte green = Convert.ToByte(e.Parameters[1]);
      byte blue = Convert.ToByte(e.Parameters[2]);

      // Do something
      EZ_Builder.Invokers.SetBackColor(label1, Color.FromArgb(red, green, blue));

      // Return something. Good idea to return TRUE if your function isn't meant to return anything
      e.ReturnValue = true;
    }
  }
}