Spire.XLS 支持在Excel中插入文本框，并在文本框中添加文本及图片，对内容进行格式化操作等。同理，对于Excel工作表中已有的文本框内容，也可以通过Spire.XLS读取出来，包括读取文本、读取图片。

测试文档如下：

//创建Workbook类的对象，并加载测试文档
Workbook workbook = new Workbook();
workbook.LoadFromFile("sample.xlsx");

//获取指定工作表
Worksheet sheet = workbook.Worksheets["Sheet1"];

//遍历工作表中文本框
for( int i = sheet.TextBoxes.Count-1; i >= 0; i--)
{
    XlsTextBoxShape shape = sheet.TextBoxes[i] as XlsTextBoxShape;

    //提取文本框中的文本
    string s = shape.Text;
    StringBuilder sb = new StringBuilder();
    sb.AppendLine(s);
    File.WriteAllText("提取文本.txt", sb.ToString());
    
    //提取文本框中的图片
    Image image = shape.Fill.Picture;
    image.Save("提取图片.png", ImageFormat.Png);
}

'创建Workbook类的对象，并加载测试文档
Dim workbook As New Workbook()
workbook.LoadFromFile("sample.xlsx")

'获取指定工作表
Dim sheet As Worksheet = workbook.Worksheets("Sheet1")

'遍历工作表中文本框
For i As Integer = sheet.TextBoxes.Count - 1 To 0 Step -1
	Dim shape As XlsTextBoxShape = TryCast(sheet.TextBoxes(i), XlsTextBoxShape)

	'提取文本框中的文本
	Dim s As String = shape.Text
	Dim sb As New StringBuilder()
	sb.AppendLine(s)
	File.WriteAllText("提取文本.txt", sb.ToString())

	'提取文本框中的图片
	Dim image As Image = shape.Fill.Picture
	image.Save("提取图片.png", ImageFormat.Png)
Next

读取结果：