我正在处理一个项目,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。当我运行应用程序时,我收到此异常,“未将对象引用设置为对象的实例。”。这是我的代码块:
private void exportbtn_Click(object sender, 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 的第一列(设施)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 时随时选择新的 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这一点:
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。
答案 0 :(得分:0)
首先,我建议你可以参考下面的代码给你的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;
}
第二,解决问题的关键是我们需要把dataGridView1.Rows.Count
改成dataGridView1.Rows.Count-1
,因为datagirdview会自动生成一个空行。
最后,这里有一个代码示例,您可以参考。
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();
}
}