c#/vb.net 读取 pdf 表单域及获取域里面的值-ag凯发旗舰厅

前面我们介绍了如何使用spire.pdf 及 ，该文将详细介绍如何使用spire.pdf读取pdf表单域及获取域里面的值。

读取pdf表单域

//创建pdfdocument实例并加载示例文档
pdfdocument pdf = new pdfdocument();
pdf.loadfromfile("sample.pdf");
//遍历fieldswidget.list获取所有表单域，并打印出表单域名称
pdfformwidget formwidget = pdf.form as pdfformwidget;
for (int i = 0; i < formwidget.fieldswidget.list.count; i  )
{
    pdffield field = formwidget.fieldswidget.list[i] as pdffield;
    string fieldname = field.name;
    console.writeline(fieldname);
}
console.writeline("--------------------------------------");
//遍历fieldswidget.list获取所有表单域，并打印出导出value为yes的表单域名称
list list = formwidget.fieldswidget.getfieldsbyexportvalue("yes");
for (int i = 0; i < list.count; i  )
{
    string fieldname = list[i].name;
    console.writeline(fieldname);
}
console.read();

'创建pdfdocument实例并加载示例文档
dim pdf as new pdfdocument()
pdf.loadfromfile("sample.pdf")
'遍历fieldswidget.list获取所有表单域，并打印出表单域名称
dim formwidget as pdfformwidget = trycast(pdf.form, pdfformwidget)
for i as integer = 0 to formwidget.fieldswidget.list.count - 1
	dim field as pdffield = trycast(formwidget.fieldswidget.list(i), pdffield)
	dim fieldname as string = field.name
	console.writeline(fieldname)
next
console.writeline("--------------------------------------")
'遍历fieldswidget.list获取所有表单域，并打印出导出value为yes的表单域名称
dim list as list(of pdffield) = formwidget.fieldswidget.getfieldsbyexportvalue("yes")
for i as integer = 0 to list.count - 1
	dim fieldname as string = list(i).name
	console.writeline(fieldname)
next
console.read()

读取域里面选择的值：

//创建pdfdocument实例并加载示例文档
pdfdocument pdf = new pdfdocument();
pdf.loadfromfile("sample.pdf");
//获取pdf文档第一页
pdfpagebase page = pdf.pages[0];
//遍历fieldswidget.list获取所有表单域
pdfformwidget formwidget = pdf.form as pdfformwidget;
for (int i = 0; i < formwidget.fieldswidget.list.count; i  )
{
    pdffield field = formwidget.fieldswidget.list[i] as pdffield;
//获取单选钮表单域并输出所选择的按钮值
    if (field is pdfradiobuttonlistfieldwidget)
    {
        pdfradiobuttonlistfieldwidget radiobutton = field as pdfradiobuttonlistfieldwidget;
        foreach (pdfradiobuttonwidgetitem item in radiobutton.widgetitems)
        {
            if (item.selected)
            {
                console.writeline(item.value);
            }
        }
    }
}
console.readkey();

'创建pdfdocument实例并加载示例文档
dim pdf as new pdfdocument()
pdf.loadfromfile("sample.pdf")
'获取pdf文档第一页
dim page as pdfpagebase = pdf.pages(0)
'遍历fieldswidget.list获取所有表单域
dim formwidget as pdfformwidget = trycast(pdf.form, pdfformwidget)
for i as integer = 0 to formwidget.fieldswidget.list.count - 1
	dim field as pdffield = trycast(formwidget.fieldswidget.list(i), pdffield)
	'获取单选钮表单域并输出所选择的按钮值
	if typeof field is pdfradiobuttonlistfieldwidget then
		dim radiobutton as pdfradiobuttonlistfieldwidget = trycast(field, pdfradiobuttonlistfieldwidget)
		for each item as pdfradiobuttonwidgetitem in radiobutton.widgetitems
			if item.selected then
				console.writeline(item.value)
			end if
		next
	end if
next
console.readkey()