Question

我对c＃相当新。

我的问题是打开文件对话框中的strFileName是什么？

我目前有这个代码：

 string input = string.Empty;

        OpenFileDialog open = new OpenFileDialog();

        open.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.* ";

        open.InitialDirectory = "C:";

        if (open.ShowDialog() == DialogResult.OK)

            strFileName = open.FileName;

        if (strFileName == String.Empty)

            return;

它会在strFileName上出现错误。我无法找到解释它在此代码中的作用。

任何帮助将不胜感激，如果以前曾询问过这个问题我会道歉。

Answer 1

在不知道错误是什么的情况下，只需查看代码，就可能在strFileName上遇到编译错误，因为它未声明：

您可以将代码更改为：

string input = string.Empty;

OpenFileDialog open = new OpenFileDialog();

open.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.* ";

open.InitialDirectory = "C:";

if (open.ShowDialog() == DialogResult.OK)

   input = open.FileName;

if (input == String.Empty)

   return;

或者这个：

string strFileName = string.Empty;

OpenFileDialog open = new OpenFileDialog();

open.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.* ";

open.InitialDirectory = "C:";

if (open.ShowDialog() == DialogResult.OK)

   strFileName = open.FileName;

if (strFileName == String.Empty)

   return;

Answer 2

它没有给我一个错误 - 虽然我必须声明它。你呢？

    string strFileName = "";  // added this line - it compiles and runs ok

    private void TestFunc()
    {
        string input = string.Empty;

        OpenFileDialog open = new OpenFileDialog();

        open.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.* ";

        open.InitialDirectory = "C:";

        if (open.ShowDialog() == DialogResult.OK)

            strFileName = open.FileName;

        if (strFileName == String.Empty)

            return;
    }

Answer 3

你需要先声明strFileName

string strFileName = string.empty();

然后使用它。

Answer 4

您需要将变量strFilename声明为字符串：

string strFileName = string.Empty;
OpenFileDialog open = new OpenFileDialog();
open.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.* ";
open.InitialDirectory = "C:";
if (open.ShowDialog() == DialogResult.OK)
{
    strFileName = open.FileName;
} 
/* you probably don't want this unless it's part of a larger block of code
if (strFileName == String.Empty)
{
    return; 
}
*/

return strFileName;

打开文件对话框中的strFileName

4 个答案: