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gridcontrol 图片列异步加载

IP云
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08/30
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在gridview中指定一列，将ColumnEdit设置成pictureEdit

在使用showDialog这里窗体后，需要frm.Dispose()将资源释放

1.将该列的UnboundType属性设置为bound(默认值)以外的数据类型

2.为该列设置一个窗体内全局唯一的FieldName，这个FieldName不能是窗体中绑定数据源的的列，否则不会触发绑定事件

3.处理CustomUnboundColumnData事件

gridView1.CustomUnboundColumnData += (s, e) => {
if (e.Column.Name == colImg1.Name)
{
//Console.WriteLine(colImg1.Name + ":" +DateTime.Now);
var it = e.Row as Q_SymptomRepositoryItem;
if (ImgDic.ContainsKey(it.Img1))
{
e.Value = ImgDic[it.Img1];
}
else
{
e.Value = XFormExtension.LoadingImgLazy.Value;
}
}
};

4.加载数据时启动图片异步下载，完成后使用SyncContext.Post刷新gridview

private void LoadImageSync(List<Q_SymptomRepositoryItem> list)
{
var imgList = list;
ThreadPool.QueueUserWorkItem((o) =>
{
using (WebClient wc = new WebClient())
{
for (int i = ; i < imgList.Count; i++)
{
var item = imgList[i];
try
{ if (string.IsNullOrWhiteSpace(item.Img1)) continue;
var bytes = wc.DownloadData(@"http://192.168.9.5:7111/getFile.ashx?rtype=repository&id=" + item.RecId); using (var ms = new MemoryStream(bytes))
{
ImgDic[item.Img1] = XFormExtension.EnsureImage(Image.FromStream(ms)); if (!IsRunning) return; SyncContext.Post((ox) =>
{
gridView1.RefreshData(); }, null);
}
}
catch (Exception ex)
{
Console.WriteLine("下载图片->" + ex.Message, "错误");
} }
} });
}

5.完整代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Linq;
using System.Windows.Forms;
using DevExpress.XtraEditors;
using DevExpress.XtraGrid;namespace WinDetectionClockAdmin
{
using DetectionClock.EFModel;
using System.Collections.Concurrent;
using System.Threading;
using System.Net;
using System.IO;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using WinDetectionClock; public partial class frmSymptomRepositoryItem : DevExpress.XtraEditors.XtraForm
{
public GridControl MainGrid { get; set; }
private SynchronizationContext SyncContext { get; set; }
public Q_SymptomRepository SymptomRepository { get; set; }
public bool IsRunning = false; private ConcurrentDictionary<string, Image> ImgDic = new ConcurrentDictionary<string, Image>(); public frmSymptomRepositoryItem(Q_SymptomRepository repository):this()
{
SymptomRepository = repository;
//加载数据
LoadData();
}
public frmSymptomRepositoryItem()
{
InitializeComponent();
MainGrid = gridControl1;
SyncContext = SynchronizationContext.Current;
this.StartPosition = FormStartPosition.CenterParent; #region 配置 gridControl this.ConfigGrid(gridControl1, true);
gridView1.CustomUnboundColumnData += (s, e) => {
if (e.Column.Name == colImg1.Name)
{
//Console.WriteLine(colImg1.Name + ":" +DateTime.Now);
var it = e.Row as Q_SymptomRepositoryItem;
if (ImgDic.ContainsKey(it.Img1))
{
e.Value = ImgDic[it.Img1];
}
else
{
e.Value = XFormExtension.LoadingImgLazy.Value;
}
}
}; gridControl1.MouseDoubleClick += (s, e) =>
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
GridHitInfo hInfo = gridView1.CalcHitInfo(new Point(e.X, e.Y));
if (!hInfo.InRow) return; //确保点的是数据行而不是标头 var ent = qSymptomRepositoryItemBindingSource.Current as Q_SymptomRepositoryItem;
if (ent == null) return; //hInfo.Column==null 标示点了行头
if (hInfo.Column!=null && hInfo.Column.Caption == "图片")
{ ////var img = gridView1.GetFocusedValue() as Image;
////new frmPhotoDetail(img).ShowDialog();
////return; } //双击其他标示修改
btnModify.PerformClick(); }
};
gridControl1.MouseUp += (s, e) =>
{
if (e.Button == System.Windows.Forms.MouseButtons.Right)
{
GridHitInfo hInfo = gridView1.CalcHitInfo(new Point(e.X, e.Y));
if (hInfo.InRow)
{
var ent = qSymptomRepositoryItemBindingSource.Current as Q_SymptomRepositoryItem;
if (ent != null)
{
if (hInfo.Column != null && hInfo.Column.Caption == "图片")
{
popupMenu1.ShowPopup(Control.MousePosition);
}
}
}
}
};
#endregion IsRunning = true; }
#region 窗体关闭处理
protected override void OnClosing(CancelEventArgs e)
{
IsRunning = false;
base.OnClosing(e);
}
protected override void OnClosed(EventArgs e)
{
base.OnClosed(e);
ImgDic.ToList().ForEach(ent =>
{
ent.Value.Dispose();
});
}
#endregion
#region ToolBar Action private void LoadData()
{
using (var ctx = DBCtx.GetCtx())
{
var list= ctx.Q_SymptomRepositoryItem.Where(ent => ent.MainId == SymptomRepository.RecId).ToList();
qSymptomRepositoryItemBindingSource.DataSource = list; #region 加载图片信息
LoadImageSync(list);
#endregion }
} private void LoadImageSync(List<Q_SymptomRepositoryItem> list)
{
var imgList = list;
ThreadPool.QueueUserWorkItem((o) =>
{
using (WebClient wc = new WebClient())
{
for (int i = ; i < imgList.Count; i++)
{
var item = imgList[i];
try
{ if (string.IsNullOrWhiteSpace(item.Img1)) continue;
var bytes = wc.DownloadData(@"http://192.168.9.5:7111/getFile.ashx?rtype=repository&id=" + item.RecId); using (var ms = new MemoryStream(bytes))
{
ImgDic[item.Img1] = XFormExtension.EnsureImage(Image.FromStream(ms)); if (!IsRunning) return; SyncContext.Post((ox) =>
{
gridView1.RefreshData(); }, null);
}
}
catch (Exception ex)
{
Console.WriteLine("下载图片->" + ex.Message, "错误");
} }
} });
} private void btnAdd_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
var frm = new frmSymptomRepositoryItemEdit();
frm.Owner = this;
if (frm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
qSymptomRepositoryItemBindingSource.Add(frm.NewEnt);
qSymptomRepositoryItemBindingSource.MoveLast();
LoadImageSync(new List<Q_SymptomRepositoryItem>() { frm.NewEnt as Q_SymptomRepositoryItem });
}
} private void btnModify_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{ var ent = qSymptomRepositoryItemBindingSource.Current as Q_SymptomRepositoryItem; if (ent == null) return; var old = this.Snapshoot<Q_SymptomRepositoryItem>(ent); var frm = new frmSymptomRepositoryItemEdit(ent);
frm.Owner = this;
if (frm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
qSymptomRepositoryItemBindingSource.ResetCurrentItem(); LoadImageSync(new List<Q_SymptomRepositoryItem>() { ent });
}
else
{
this.Restore<Q_SymptomRepositoryItem>(old, ent);
} //连续加载测试
btnModify.PerformClick();
} private void btnDel_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
try
{
var cur = qSymptomRepositoryItemBindingSource.Current as Q_SymptomRepositoryItem;
if (cur == null) return; if (MessageBox.Show("您确定删除吗?", "警告", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == System.Windows.Forms.DialogResult.Yes)
{
using (var ctx = DBCtx.GetCtx())
{
var it = ctx.Q_SymptomRepositoryItem.FirstOrDefault(ent => ent.RecId == cur.RecId);
if (it != null)
{
ctx.DeleteObject(it); ctx.SaveChanges();
qSymptomRepositoryItemBindingSource.Remove(cur);
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
} private void btnRefresh_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
LoadData();
} private void btnFilter_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
this.ShowFilter();
}
#endregion private void btnViewImg_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
popupMenu1.HidePopup();
var img = gridView1.GetFocusedValue() as Image;
new frmPhotoDetail(img).ShowDialog();
return;
} private void frmSymptomRepositoryItem_Load(object sender, EventArgs e)
{ var timer = new System.Windows.Forms.Timer();
timer.Interval = ;
timer.Tick += (s, ie) =>
{
timer.Enabled = false;
this.Close();
};
timer.Start();
}
}
}