NPOI读取word！！求解

[我是一只奋斗的蜗牛]

private void button3_Click(object sender, EventArgs e)
{
using (FileStream docx = File.OpenRead(textBox1.Text))
{
XWPFDocument docx1= new XWPFDocument(docx);
foreach (var para in docx1.Paragraphs)
{
string texts= para.ParagraphText; //获得文本
var runs = para.Runs;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < runs.Count; i++)
{
var run = runs[i];
texts = run.ToString(); //获得run的文本
do
{
sb.Append(texts);
}
while (i > runs.Count);
}
textBox3.Text = sb.ToString();
}
}

}
问题：1.runs代表什么/代码中runs.count代表段落吗？