记录一次使用NPOI遇到的问题
<p>在.net 下一样平常利用NPOI利用Excel相信各人都不生疏,但是本人在利用过程中碰到一个比力奇怪的问题,特写此博客记载与各人分享。</p><p>例子是利用Winform,点击按钮时弹出打开文件对话框,然后选择文件来读取Excel。</p>
<p>最开始代码时如许写的:</p>
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1 private void button1_Click(object sender, EventArgs e)
2 {
3 OpenFileDialog ofd = new OpenFileDialog {Filter = "excel文件|*.xls"};
4 if (ofd.ShowDialog() == DialogResult.OK)
5 {
6 using (FileStream fs = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read))
7 {
8 IWorkbook workbook = new HSSFWorkbook(fs);
9 ISheet sheet = workbook.GetSheetAt(0);
10
11 //统共有多少行
12 int lastRowNum = sheet.LastRowNum;
13 int firstRowNum = sheet.FirstRowNum;
14
15 for (int i = firstRowNum + 1; i <= lastRowNum; i++)
16 {
17 IRow row = sheet.GetRow(i);
18 if (row == null)
19 {
20 continue;
21 }
22 string name = row.Cells?.ToString();
23
24 if (string.IsNullOrEmpty(name))
25 {
26 //空行
27 continue;
28 }
29
30 string birthplace = row.Cells?.ToString();
31 string major = row.Cells?.ToString();
32 string className = row.Cells?.ToString();
33 double height = row.Cells.NumericCellValue;
34 double age = row.Cells.NumericCellValue;
35
36 Console.WriteLine($"name:{name},birthplace:{birthplace},major:{major},className:{className},height:{height},age:{age}");
37
38 }
39 }
40 }
41 }
View Code
<p>然后Excel是如许的:</p>
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<p> </p>
<p> 调试时,碰到错误:</p>
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<p> </p>
<p> 监视变量i,看是循环到第几行:</p>
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<p> </p>
<p> 这里是3,也就是第三行(标题除外),第三行的内容是如许的:</p>
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<p> </p>
<p> 这里表明一下,这个表格利用了白色背景添补,然后前面三行(包罗标题在内)利用了实线的细边框。</p>
<p>再在监视里输入代码row.Cells.Count,获取得到的结果是4,也就是第三行只有4“列”(这里列加了双引号)。明明就有6列,怎么会只有4列,于是再在监视里输入row.LastCellNum,得到的结果是6。</p>
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<p> </p>
<p> 这里可以看出有6列,我们知道获取列有row.Cells 大概是 row.GetCell(i) , 于是实验在监视里输入row.GetCell(4),看是否会报错:</p>
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<p> </p>
<p> </p>
<p>发现没有报错,而且“值“一栏是准确的列的内容。</p>
<p>于是将代码里row.Cells 改成 row.GetCell(i) 的形式:</p>
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private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog {Filter = "excel文件|*.xls"};
if (ofd.ShowDialog() == DialogResult.OK)
{
using (FileStream fs = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read))
{
IWorkbook workbook = new HSSFWorkbook(fs);
ISheet sheet = workbook.GetSheetAt(0);
//统共有多少行
int lastRowNum = sheet.LastRowNum;
int firstRowNum = sheet.FirstRowNum;
for (int i = firstRowNum + 1; i <= lastRowNum; i++)
{
IRow row = sheet.GetRow(i);
if (row == null)
{
continue;
}
string name = row.GetCell(0)?.ToString();
if (string.IsNullOrEmpty(name))
{
//空行
continue;
}
string birthplace = row.GetCell(1)?.ToString();
string major = row.GetCell(2)?.ToString();
string className = row.GetCell(3)?.ToString();
double height = row.GetCell(4).NumericCellValue;
double age = row.GetCell(5).NumericCellValue;
Console.WriteLine($"name:{name},birthplace:{birthplace},major:{major},className:{className},height:{height},age:{age}");
}
}
}
}
View Code
<p>再次调试,没有报错,在输出窗口有以下的信息:</p>
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<p> </p>
<p> </p>
<p> </p><br><br/><br/><br/><br/><br/>来源:<a href="https://www.cnblogs.com/godbell/archive/2019/09/15/11524896.html" target="_blank">https://www.cnblogs.com/godbell/archive/2019/09/15/11524896.html</a>
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