18. Opening and saving file dialog box usage notes

Preface ： Open the dialog box 、 The save dialog box is often used by desktop software , But the author recently found that the same name API There are different namespaces , Now record .

One 、 Official website API

1.1 System.Windows.Forms

OpenFileDialog and SaveFileDialog These two dialog boxes first appeared in System.Windows.Forms Under the namespace , With .Net Framwork1.1 The version came out . And they also quote System.ComponentModel Namespace .

1.2 Microsoft.Win32

And in Microsoft.Win32 Under the OpenFileDialog and SaveFileDialog The function is in .Net Framwork3.0 That's what happened , and Microsoft.Win32 Application programming interface (API) Is used for win32 A series of interface development programs .

 

Two 、 usage

It's almost the same , Just reference the corresponding namespace , One of the differences I encountered when using is ShowDialog() The return type of .

         The referenced namespace is Microsoft.Win32
        /// <summary>
        /// 220723 komla  File selection dialog 
        /// </summary>
        void SelectFileDialog()
        { 
            OpenFileDialog fie = new OpenFileDialog();
            // Create objects 
            fie.Title = " Upload your avatar ";
            // Set text box title 
            fie.InitialDirectory = @"C:\Users\Administrator\Desktop";
            // The initial directory of the dialog 
            fie.Filter = " image file |*.jpg*| image file |*.png| All the files |*.*";
            // Set file type 
            string str = fie.FileName;
            // Get the path of choice 
            if (fie.ShowDialog() == true)
            {
                MessageBox.Show(fie.FileName);
                // The user clicks   open   Code to hold the lamp after 
            } 
        }
   
        /// <summary>
        /// 220723 komla  File Save dialog 
        /// </summary>
        void SaveFileDialog()
        {
            SaveFileDialog s = new SaveFileDialog();
            // Create objects 
            s.Filter = " image file |*.jpg| image file |*.png| All the files |*.*";
            // Saved file extension 
            s.Title = " Save the file ";
            // Dialog title 
            s.DefaultExt = " image file |*.jpg";
            // Set the default file extension  
            // string str = s.DefaultExt;
            // Get the file default extension 
            s.InitialDirectory = @"C:\Users\Administrator\Desktop";
            // Set the initial directory for saving 
            if (s.ShowDialog() == true)
            {
                // The user clicks " preservation " Code executed after 
            }
            string str = s.FileName;
            // Get the directory saved by the user 

        }

If quoted System.Windows.Forms Namespace only needs to be ShowDialog() To change the value of DialogResult.OK

if (s.ShowDialog() == DialogResult.OK)
{
    // The user clicks " preservation " Code executed after 
}

3、 ... and 、 Citations

3.1 C# “ File selection dialog “ and “ Save Dialog “_ The donkey of the production team . The blog of -CSDN Blog _c# Select file dialog box  

3.2 OpenFileDialog class (System.Windows.Forms) | Microsoft Docs