PM> Install-Package Spire.XLS

using System;
using Spire.Xls;
using Spire.Xls.Core;

namespace GetFormControl
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建Workbook类的实例，加载Excel文档
            Workbook wb = new Workbook();
            wb.LoadFromFile("sample.xlsx");

            //获取第1张工作表
            Worksheet sheet = wb.Worksheets[0];

            //获取TextBox
            ITextBox textbox = sheet.TextBoxes[0];          
            string textcontent = textbox.Text;
            Console.WriteLine("TextBox: "+ textcontent);
            Console.ReadLine();

            //获取Radio Button
            for (int i = 0; i < sheet.RadioButtons.Count; i++)
            {
                IRadioButton radioButton = sheet.RadioButtons[i];
                string name = radioButton.CheckState.ToString();
                string text = radioButton.Text;
                bool islocked = radioButton.IsLocked;
                Console.WriteLine("RadioButtons: " + name + text + " 是否锁定：" + islocked.ToString());
                Console.ReadLine();
            }

            //获取Combo Box控件中的选中的值（注：非列表中所有选项值）            
            string value = sheet.ComboBoxes[0].SelectedValue;
            Console.WriteLine("ComboBoxes: " + value);
            Console.ReadLine();                       

            //获取Checkbox
            for (int z = 0; z < sheet.CheckBoxes.Count; z++)
            {
                ICheckBox checkBox = sheet.CheckBoxes[z];
                string text = checkBox.Text;
                string name = checkBox.CheckState.ToString();
                string alternativetext = checkBox.AlternativeText;
                Console.WriteLine("CheckBoxes: " + text + name + alternativetext);
                Console.ReadLine();
            }

            //获取SpinnerShape
            for (int j = 0; j < sheet.SpinnerShapes.Count; j++)
            {
                ISpinnerShape spinnerShape = sheet.SpinnerShapes[j];
                string rangeAddress = spinnerShape.LinkedCell.RangeAddress;
                int currentValue = spinnerShape.CurrentValue;
                Console.WriteLine("SpinnerShapes: RangeAddress is " + rangeAddress + "\n"+"CurrentValue:" + currentValue);
                Console.ReadLine();               
            }

        }
    }
}

Imports Spire.Xls
Imports Spire.Xls.Core

Namespace GetFormControl
	Class Program
		Private Shared Sub Main(args As String())
			'创建Workbook类的实例，加载Excel文档
			Dim wb As New Workbook()
			wb.LoadFromFile("sample.xlsx")

			'获取第1张工作表
			Dim sheet As Worksheet = wb.Worksheets(0)

			'获取TextBox
			Dim textbox As ITextBox = sheet.TextBoxes(0)
			Dim textcontent As String = textbox.Text
			Console.WriteLine(Convert.ToString("TextBox: ") & textcontent)
			Console.ReadLine()

			'获取Radio Button
			For i As Integer = 0 To sheet.RadioButtons.Count - 1
				Dim radioButton As IRadioButton = sheet.RadioButtons(i)
				Dim name As String = radioButton.CheckState.ToString()
				Dim text As String = radioButton.Text
				Dim islocked As Boolean = radioButton.IsLocked
				Console.WriteLine((Convert.ToString(Convert.ToString("RadioButtons: ") & name) & text) + " 是否锁定：" + islocked.ToString())
				Console.ReadLine()
			Next

			'获取Combo Box控件中的选中的值（注：非列表中所有选项值）            
			Dim value As String = sheet.ComboBoxes(0).SelectedValue
			Console.WriteLine(Convert.ToString("ComboBoxes: ") & value)
			Console.ReadLine()

			'获取Checkbox
			For z As Integer = 0 To sheet.CheckBoxes.Count - 1
				Dim checkBox As ICheckBox = sheet.CheckBoxes(z)
				Dim text As String = checkBox.Text
				Dim name As String = checkBox.CheckState.ToString()
				Dim alternativetext As String = checkBox.AlternativeText
				Console.WriteLine(Convert.ToString(Convert.ToString(Convert.ToString("CheckBoxes: ") & text) & name) & alternativetext)
				Console.ReadLine()
			Next

			'获取SpinnerShape
			For j As Integer = 0 To sheet.SpinnerShapes.Count - 1
				Dim spinnerShape As ISpinnerShape = sheet.SpinnerShapes(j)
				Dim rangeAddress As String = spinnerShape.LinkedCell.RangeAddress
				Dim currentValue As Integer = spinnerShape.CurrentValue
				Console.WriteLine((Convert.ToString("SpinnerShapes: RangeAddress is ") & rangeAddress) + vbLf + "CurrentValue:" + currentValue)
				Console.ReadLine()
			Next

		End Sub
	End Class
End Namespace