将datagridview数据导出到Excel工作表

Question

我正在做一个项目，我需要将 datagridview 数据导出到 excel 表中。 我的 datagridview 有 38 列和大约 120 行（单词之间有空格），数据是从 datagridview 输入的。 当我运行该应用程序时，我收到此异常，“Object 引用未设置为 object 的实例。”。 这是我的代码块：

私人无效exportbtn_Click（对象发送者，EventArgs e）

        if (saveFileDialog1.ShowDialog() != DialogResult.Cancel)
        {
            Microsoft.Office.Interop.Excel.Application ExcelApp = new Microsoft.Office.Interop.Excel.Application();
            ExcelApp.Application.Workbooks.Add(Type.Missing);
            ExcelApp.Columns.AutoFit();

            for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
            {
                ExcelApp.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
            }

            for (int i = 0; i < dataGridView1.Rows.Count; i++)
            {
                for (int j = 0; j < dataGridView1.Columns.Count; j++)
                {
                   ExcelApp.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                }
                MessageBox.Show("Data Exported Successfully");
            }
            ExcelApp.ActiveWorkbook.SaveAs("");
            ExcelApp.ActiveWorkbook.Saved = true;              
            ExcelApp.Visible = true;
            ExcelApp.Quit();
         
         }

我将datagridview第一列（Facillity）填充为：

        ArrayList row = new ArrayList();
        row.Add("Techiman Holy Family Hospital"); dataGridView1.Rows.Add(row.ToArray());
        row = new ArrayList();
        row.Add("Opoku Agyeman Hospital"); dataGridView1.Rows.Add(row.ToArray());
        row = new ArrayList();
        row.Add("Kintampo Municipal Hospital"); dataGridView1.Rows.Add(row.ToArray());

此外，我不想在导出到 excel 的任何时候选择新的 excel 工作簿。 我想将所有工作表保存在同一个工作簿中。 有没有办法编辑以下代码来实现：

        saveFileDialog1.InitialDirectory = ("C:");
        saveFileDialog1.Title = "Save as Excel File";
        saveFileDialog1.FileName = "";
        saveFileDialog1.Filter = "Excel Files(2003)|*.xls| Excel Files(2007)|*.xlsx";

请问有什么帮助吗？ 谢谢。

Answer 1

首先，我建议你可以参考下面的代码来给你的datagridview添加数据。

 private void Form1_Load(object sender, EventArgs e)
        {
            DataTable table = new DataTable();
            table.Columns.Add("Hospital");
            table.Columns.Add("Name");
            table.Columns.Add("Age");
            table.Columns.Add("Address");
            table.Columns.Add("Id");
            table.Columns.Add("Sex");
            table.Rows.Add("Techiman Holy Family Hospital", "test11", "22","home","1001","Man");
            table.Rows.Add("Techiman Holy Family Hospital", "test2", "23", "home", "1001", "Man");
            table.Rows.Add("Opoku Agyeman Hospital", "test8", "22", "home", "1001", "Man");
            table.Rows.Add("Opoku Agyeman Hospital", "test6", "26", "home", "1001", "Man");
            table.Rows.Add("Kintampo Municipal Hospital", "test21", "22", "home", "1001", "Man");
            table.Rows.Add("Kintampo Municipal Hospita", "test12", "22", "home", "1001", "Man");
            dataGridView1.DataSource = table;
        }

其次，解决问题的关键是我们需要将dataGridView1.Rows.Count更改为dataGridView1.Rows.Count-1 ，因为datagirdview会自动生成一个空行。

最后，这是一个您可以参考的代码示例。

 private void button1_Click(object sender, EventArgs e)
        {
            saveFileDialog1.InitialDirectory = ("E:");
            saveFileDialog1.Title = "Save as Excel File";
            saveFileDialog1.FileName = "";
            saveFileDialog1.Filter = "Excel Files(2003)|*.xls| Excel Files(2007)|*.xlsx";

            if (saveFileDialog1.ShowDialog() != DialogResult.Cancel)
            {
                Excel.Application ExcelApp = new Excel.Application();
                ExcelApp.Application.Workbooks.Add(Type.Missing);
                ExcelApp.Columns.AutoFit();
                Excel.Worksheet sheet = ExcelApp.ActiveSheet;
                for (int i = 0; i < dataGridView1.Columns.Count; i++)
                {
                    sheet.Cells[1, i+1] = dataGridView1.Columns[i].HeaderText;
                }

                for (int i = 0; i < dataGridView1.Rows.Count-1; i++)
                {
                    for (int j = 0; j < dataGridView1.Columns.Count; j++)
                    {
                        sheet.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                    }
                    
                }
                MessageBox.Show("Data Exported Successfully");
                sheet.SaveAs(saveFileDialog1.FileName);
                ExcelApp.Visible = true;
                ExcelApp.Quit();
                
            }
        }