c# - Open File Filter not working

Question

I am making a program to open an Excel file in C# and get the data from it.

private void XLConnect_Click(object sender, EventArgs e)
{
    type = 1;
    open.Filter = "Excel|.xlsx";
    open.ShowDialog();
}

public void readFile()
{
    if (type == 1)
    {
        MessageBox.Show("Success");
    }
}

My problem with the code is that when the open dialog appears, it doesnt show any file to select. What is wrong in the code?

Answer 1

1. 在过滤器中使用星号。
2. 可能您的机器只包含旧式 Excel 文件？

使用此过滤器：

open.Filter = "Excel (*.xls, *.xlsx)|*.xls;*.xlsx";

Answer 2

您必须使用通配符，在本例中为星号 (*)：

private void XLConnect_Click(object sender, EventArgs e)
{ 
    type = 1;
    open.Filter = "Excel|*.xlsx";
    open.ShowDialog();
}

Answer 3

你声明了open吗？

OpenFileDialog open = new OpenFileDialog();

至于过滤器，请使用*.

open.Filter = "Excel|*.xlsx";