我有3种方法，名为getUserID，getgazeID和updateHeatmapURL
这是 getUserID
private static int getUserID()
{
int returnValue = -1;
try
{
TextReader tr = new StreamReader("C:\\Users\\L31304\\Desktop\\user.txt");
string checkedSubject = tr.ReadLine();
tr.Close();
MySqlCommand selectUser = new MySqlCommand();
selectUser.Connection = c;
selectUser.CommandText = "SELECT userID from user WHERE name= @personName";
selectUser.CommandType = CommandType.Text;
selectUser.Parameters.Add("@personName", MySqlDbType.VarChar).Value = checkedSubject;
returnValue = (int)selectUser.ExecuteScalar();
Console.WriteLine("returnValue for User-" + returnValue);
return returnValue;
}
catch (Exception e)
{
Console.WriteLine("returnValue Exception-" + e.ToString());
return returnValue;
}
}
这是 getgazeID
private static int getgazeID(int userID)
{
int returnValueGaze = -1;
try
{
MySqlCommand selectGaze = new MySqlCommand();
selectGaze.Connection = c;
selectGaze.CommandText = "SELECT gazeID from gazeperiod WHERE userID = @userID";
selectGaze.CommandType = CommandType.Text;
selectGaze.Parameters.Add("@userID", MySqlDbType.Int64).Value = userID;
returnValueGaze = (int)selectGaze.ExecuteScalar();
Console.WriteLine("returnValue for Gaze-" + returnValueGaze);
return returnValueGaze;
}
catch (Exception e)
{
Console.WriteLine("returnValue Exception for gazePeriod-" + e.ToString());
return returnValueGaze;
}
}
这是updateheatmapURL
private static int updateHeatmapURL()
{
try
{
MySqlCommand selectGaze = new MySqlCommand();
selectGaze.Connection = c;
selectGaze.CommandText = "UPDATE gazeperiod(heatmapURL) VALUES (@heatmapURL) WHERE userID = @userID AND gazeID = @gazeID";
selectGaze.CommandType = CommandType.Text;
selectGaze.Parameters.Add("@heatmapURL", MySqlDbType.VarChar).Value = dlg.FileName;
selectGaze.Parameters.Add("@userID", MySqlDbType.Int64).Value = userID;
selectGaze.Parameters.Add("@gazeID", MySqlDbType.Int64).Value = gazeID;
selectGaze.ExecuteScalar();
Console.WriteLine("heatmapURL - " + dlg.FileName);
}
catch (Exception e)
{
Console.WriteLine("Exception for heatmapURL-" + e.ToString());
}
}
这就是dlg的来源。
public static bool ExportImageToFile(Image image)
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.Title = "Please enter filename for image...";
dlg.InitialDirectory = Environment.SpecialFolder.MyDocuments.ToString();
dlg.Filter = "JPEG Format - jpg|*.jpg|Bitmap Format - bmp|*.bmp|Graphics Interchange Format - gif|*.gif|Portable Networks Graphic - png|*.png|Tag Image File Format - tif|*.tif|Windows MetaFile Format - wmf|*.wmf";
dlg.FileName = "*.jpg";
dlg.AddExtension = true;}
但是，userID，gazeID和dlg.FileName说：
＆＃39;该名称在当前上下文中不存在。＆＃39;
如何在updateURL中调用它以使其存在？
public static bool ExportImageToFile(Image image)
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.Title = "Please enter filename for image...";
dlg.InitialDirectory = Environment.SpecialFolder.MyDocuments.ToString();
//dlg.InitialDirectory = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), "new_folder2");
bool saveToServer = false;
//check....
if (System.IO.File.Exists("C:\\Users\\L31304\\Desktop\\user.txt"))
{
dlg.InitialDirectory = @"\\111.11.111.111\c$\Users\L31303\person\EyeTrackerWeb\WebContent\uploadheatmap";
saveToServer = true;
}
//set bool to true
//end if
dlg.Filter = "JPEG Format - jpg|*.jpg|Bitmap Format - bmp|*.bmp|Graphics Interchange Format - gif|*.gif|Portable Networks Graphic - png|*.png|Tag Image File Format - tif|*.tif|Windows MetaFile Format - wmf|*.wmf";
dlg.FileName = "*.jpg";
dlg.AddExtension = true;
dlg.RestoreDirectory = true;
if (dlg.ShowDialog() == DialogResult.OK)
{
ImageFormat format;
switch (dlg.FilterIndex)
{
case 1:
format = ImageFormat.Jpeg;
break;
case 2:
format = ImageFormat.Bmp;
break;
case 3:
format = ImageFormat.Gif;
break;
case 4:
format = ImageFormat.Png;
break;
case 5:
format = ImageFormat.Tiff;
break;
case 6:
format = ImageFormat.Wmf;
break;
default:
format = ImageFormat.Jpeg;
break;
}
try
{
image.Save(dlg.FileName, format);
Console.WriteLine("file name is" + dlg.FileName);
if (saveToServer == true)
{
connectDB();
OpenConnection();
int userID = getUserID();
int gazeID = getgazeID(userID);
CloseConnection();
}
else
{
}
//if bool == true, then do the following
//select userID from user table WHERE name is name from text file
//select gazePeriodID from gazePeriod where userID the above selected userID
//update image path to gazePeriod in heatmapimage
//delete text file
}
catch (Exception ex)
{
VGExceptionMethods.HandleException(ex);
return false;
}
}
return true;
}
private static int getUserID()
{
int returnValue = -1;
try
{
TextReader tr = new StreamReader("C:\\Users\\L31304\\Desktop\\user.txt");
string checkedSubject = tr.ReadLine();
tr.Close();
MySqlCommand selectUser = new MySqlCommand();
selectUser.Connection = c;
selectUser.CommandText = "SELECT userID from user WHERE name= @personName";
selectUser.CommandType = CommandType.Text;
selectUser.Parameters.Add("@personName", MySqlDbType.VarChar).Value = checkedSubject;
returnValue = (int)selectUser.ExecuteScalar();
Console.WriteLine("returnValue for User-" + returnValue);
return returnValue;
}
catch (Exception e)
{
Console.WriteLine("returnValue Exception-" + e.ToString());
return returnValue;
}
}
private static int getgazeID(int userID)
{
int returnValueGaze = -1;
try
{
MySqlCommand selectGaze = new MySqlCommand();
selectGaze.Connection = c;
selectGaze.CommandText = "SELECT gazeID from gazeperiod WHERE userID = @userID";
selectGaze.CommandType = CommandType.Text;
selectGaze.Parameters.Add("@userID", MySqlDbType.Int64).Value = userID;
returnValueGaze = (int)selectGaze.ExecuteScalar();
Console.WriteLine("returnValue for Gaze-" + returnValueGaze);
return returnValueGaze;
}
catch (Exception e)
{
Console.WriteLine("returnValue Exception for gazePeriod-" + e.ToString());
return returnValueGaze;
}
}
public class Form1 : Form
{
private static Form1 _instance;
public Form1()
{
this.InitializeComponent();
_instance = this;
}
private static int updateHeatmapURL()
{
try
{
MySqlCommand selectGaze = new MySqlCommand();
selectGaze.Connection = c;
selectGaze.CommandText = "UPDATE gazeperiod(heatmapURL) VALUES (@heatmapURL) WHERE userID = @userID AND gazeID = @gazeID";
selectGaze.CommandType = CommandType.Text;
var userID = getUserID();
selectGaze.Parameters.Add("@heatmapURL", MySqlDbType.VarChar).Value = _instance.dlg.FileName;
selectGaze.Parameters.Add("@userID", MySqlDbType.Int64).Value = userID;
selectGaze.Parameters.Add("@gazeID", MySqlDbType.Int64).Value = getgazeID(userID);
selectGaze.ExecuteScalar();
Console.WriteLine("heatmapURL - " + _instance.dlg.FileName);
}
catch (Exception e)
{
Console.WriteLine("Exception for heatmapURL-" + e.ToString());
}
}
}
班级
public class Images
{
private static MySqlConnection c;
private static string server;
private static string database;
private static string uid;
private static string password;
答案 0 :(得分：1)
试试这个
//update these lines in updateHeatmapURL mthod
// dlg.File name is not accessable because updateHeatmapURL method is static
// use instance to access dlg or remove static, if you remove static then you need to remove it from other two methods as well
var userId = getUserID();
selectGaze.Parameters.Add("@userID", MySqlDbType.Int64).Value = userId;
selectGaze.Parameters.Add("@gazeID", MySqlDbType.Int64).Value = getgazeID(userId);
修改
public class Form1 : Form
{
private static Form1 _instance;
public Form1()
{
InitializeComponent();
_instance = this;
}
private static int updateHeatmapURL()
{
...
selectGaze.Parameters.Add("@heatmapURL", MySqlDbType.VarChar).Value = _instance.dlg.FileName;
var userId = getUserID();
selectGaze.Parameters.Add("@userID", MySqlDbType.Int64).Value = userId;
selectGaze.Parameters.Add("@gazeID", MySqlDbType.Int64).Value = getgazeID(userId);
...
}
}