VARCHART XGantt是一個(gè)交互式的甘特圖控件，其模塊化的設(shè)計(jì)讓您可以創(chuàng)建滿(mǎn)足您和您的客戶(hù)所需求的應(yīng)用程序。（我們領(lǐng)先的甘特圖控件VARCHART XGantt可用于.NET，ActiveX和ASP.NET應(yīng)用程序。）使用交互式甘特圖提供令人驚嘆的視覺(jué)調(diào)度體驗(yàn)，增強(qiáng)您的計(jì)劃用戶(hù)體驗(yàn)。

本文介紹了VARCHART XGantt常見(jiàn)問(wèn)題中的如何提高性能問(wèn)題，并且針對(duì)該問(wèn)題作出回答，現(xiàn)在就來(lái)了解一下吧~

點(diǎn)擊下載VARCHART XGantt正式版

如果對(duì)每個(gè)節(jié)點(diǎn)重復(fù)執(zhí)行更新操作，則包含大量節(jié)點(diǎn)的項(xiàng)目可能會(huì)花費(fèi)太長(zhǎng)時(shí)間。并非每個(gè)自動(dòng)更新過(guò)程都是必需的；在這種情況下，您可以暫停單個(gè)更新，處理一系列代碼，然后進(jìn)行最終更新。暫停和重新激活更新都可以通過(guò)SuspendUpdate方法完成，該方法在代碼序列的開(kāi)頭設(shè)置為True，在代碼序列的結(jié)尾設(shè)置為False。使用此方法可以顯著提高整體性能。

示例代碼VB.NET

Dim dataTable As VcDataTable
Dim dataRecordCltn As VcDataRecordCollection
Dim dataRecord As VcDataRecord
dataTable = VcGantt1.DataTableCollection.DataTableByName("Maindata")
dataRecordCltn = dataTable.DataRecordCollection
VcGantt1.SuspendUpdate(True)
For Each dataRecord In dataRecordCltn
 dataRecord.DataField(4) = "10"
 dataRecord.Update()
Next
VcGantt1.SuspendUpdate(False) 

示例代碼C＃

VcDataTable dataTable =
vcGantt1.DataTableCollection.DataTableByName("Maindata");
VcDataRecordCollection dataRecordCltn = dataTable.DataRecordCollection;
vcGantt1.SuspendUpdate(true);
foreach (VcDataRecord dataRecord in dataRecordCltn)
{
 dataRecord.set_DataField(4, "10");
 dataRecord.Update();
}
vcGantt1.SuspendUpdate(false); 

您還可以通過(guò)SuspendUpdate方法加快鏈接的更新過(guò)程。

示例代碼VB.NET

Private Sub ModifyTable_Click()
 Dim formatCltn As VcTableFormatCollection
 Dim aFormat As VcTableFormat
 Dim index As Integer
 VcGantt1.SuspendUpdate(True)
 formatCltn = VcGantt1.LeftTable.TableFormatCollection
 For Each aFormat In formatCltn
 For index = 1 To aFormat.FormatFieldCount
 aFormat.FormatField(index).BackgroundColor = Color.Green
 aFormat.FormatField(index).TextFontColor = Color.Red
 aFormat.FormatField(index).Alignment =
VcFormatFieldAlignment.vcFFACenter
 Next
 Next
 VcGantt1.SuspendUpdate(False)
End Sub 

示例代碼C＃

private void ModifyTable_Click()
 {
 VcTableFormatCollection formatCltn =
vcGantt1.LeftTable.TableFormatCollection;
 vcGantt1.SuspendUpdate(true);
 foreach (VcTableFormat aFormat in formatCltn)
 {
 for (int index=1; index <= aFormat.FormatFieldCount; index++) { aFormat.get_FormatField(index).BackgroundColor = Color.Green; aFormat.get_FormatField(index).TextFontColor = Color.Red; aFormat.get_FormatField(index).Alignment = VcFormatFieldAlignment.vcFFACenter; } } vcGantt1.SuspendUpdate(false); } 

當(dāng)您使用不等距的直方圖曲線時(shí)，此方法還可以加快更新過(guò)程。

示例代碼VB.NET

Dim histogram As VcHistogram
Dim curve As VcCurve
Dim index As Integer
Dim aDate As Date
histogram = VcGantt1.HistogramCollection.FirstHistogram
curve = histogram.CurveCollection.CurveByName("Curve1") 
' current date
aDate = Date.Today()
VcGantt1.SuspendUpdate(True)
For index = 1 To 3000
 ' shifting by 2 hrs
 aDate = aDate.AddHours(2)
 curve.SetValues(aDate, index)
Next
VcGantt1.SuspendUpdate(False) 

示例代碼C＃

// current date
DateTime aDate = DateTime.Today;
vcGantt1.SuspendUpdate(true);
for (int index=1; index < 3000; index++) { // shifting by 2 hrs aDate = aDate.AddHours(2); curve.SetValues(aDate, Convert.ToString(index)); } vcGantt1.SuspendUpdate(false); 

圖形

性能低下的另一個(gè)原因可能是表、節(jié)點(diǎn)或框字段中的圖形太大或像素太多。

本文是關(guān)于.NET版本中的提高性能，關(guān)于ActiveX版本中提高性能的問(wèn)題，后續(xù)將會(huì)更新，敬請(qǐng)期待哦~您還可以下載VARCHART XGantt試用版進(jìn)行免費(fèi)體驗(yàn)~

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