“读取/显示Excel时，无法对空引用执行运行时绑定”

我准备了一个简单的代码来读取excel文件到c＃wpf格式。

但我收到错误：

{"Cannot perform runtime binding on a null reference"}. 

下面是代码….

 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using Excel = Microsoft.Office.Interop.Excel; namespace WindowsFormsApplication9 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Excel.Application xlApp = new Excel.Application(); Excel.Workbook xlWorkbook = xlApp.Workbooks.Open("Book1.xlsx"); Excel._Worksheet xlWorksheet = xlWorkbook.Sheets[1]; Excel.Range xlRange = xlWorksheet.UsedRange; int rowCount = xlRange.Rows.Count; int colCount = xlRange.Columns.Count; for (int i = 1; i <= rowCount; i++) { for (int j = 1; j<= colCount; j++) { MessageBox.Show(xlRange.Cells[i, j].Value2.ToString()); } } } } } 

Answer 1

不要使用.ToString()方法。 当值为空时，会引起空引用exception。

使用可以使用Convert.ToString()