C# 绑定表适配器在调用两次之前不会更新
来自 vb.net 的 C# 新手,我现在只是制作一些模拟绑定应用程序。我对以下代码有问题。如果我拍摄图像并退出应用程序,则不会发生任何变化。即使我移动一排。但是,如果我上传图像,请移动到另一行,然后添加另一张图像。退出应用程序后,将出现第一张图像,但不会出现第二张图像。
简而言之,我必须尝试上传到另一条记录,然后我真正想要更新的记录才会这样做。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace DBUserManagement
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'dsUsers.Users' table. You can move, or remove it, as needed.
this.usersTableAdapter.Fill(this.dsUsers.Users);
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (DialogResult.OK == ofd.ShowDialog())
{
imgUser.SizeMode = PictureBoxSizeMode.StretchImage;
imgUser.Image = new Bitmap(ofd.OpenFile());
//update bound field.
usersTableAdapter.Update(dsUsers);
}
}
}
}
关于我缺少或不正确理解的内容有什么想法吗?任何帮助表示赞赏。
/P
New to C# from vb.net and I am just making some mock bound applications for now. I have problems with the following code. If I pic an image and exit the application, there is no change. Even if I move a row. However if I upload an image, move to another row, then add another image. After exiting the application the first image will be there but not the second.
In short I have to attempt to upload to another record before the record I actually want updating will do so.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace DBUserManagement
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'dsUsers.Users' table. You can move, or remove it, as needed.
this.usersTableAdapter.Fill(this.dsUsers.Users);
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
if (DialogResult.OK == ofd.ShowDialog())
{
imgUser.SizeMode = PictureBoxSizeMode.StretchImage;
imgUser.Image = new Bitmap(ofd.OpenFile());
//update bound field.
usersTableAdapter.Update(dsUsers);
}
}
}
}
Any ideas on what I am missing or not understand correctly? Any help appreciated.
/P
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答案是我需要调用 BindingSource 的 .EndEdit();方法。
所以我猜测这归因于绑定源仍然保留着某些东西。
无论如何,看来我走在正确的轨道上,我在 MSDN 上查找了详细信息:)
The answer was I needed to call the BindingSource's .EndEdit(); method.
So I am guessing it was down to the binding source still having hold of something.
Seems like I'm on the right track anyhow, I looked up the details on MSDN :)