未在組合框的SelectedIndexChanged上設置標籤值（僅在一種情況下）

-1

這可能是我遇到的最奇怪的（也可能是最簡單的）錯誤。我有一個ComboBox 3項。根據選定的索引，我設置了3 PictureBoxes和標籤文本的可見性。後者的問題是：未在組合框的SelectedIndexChanged上設置標籤值（僅在一種情況下）

private void myCombo_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    switch (myCombo.SelectedIndex) 
    { 
     case 0: // basic 
      pictureBoxBasicCampaign.Visible = true; 
      pictureBoxApsisCampaign.Visible = false; 
      pictureBoxPushCampaign.Visible = false; 
      lblCampaignTypeDescription.Text = "Runs or schedules a campaign that writes the recipient data into a file or another database table."; 
      break; 
     case 1: // apsis 
      pictureBoxBasicCampaign.Visible = false; 
      pictureBoxApsisCampaign.Visible = true; 
      pictureBoxPushCampaign.Visible = false; 
      lblCampaignTypeDescription.Text = "Runs or schedules a campaign that sends a newsletter or SMS message to recipients via APSIS."; 
      break; 
     case 2: // push    
      pictureBoxBasicCampaign.Visible = false; 
      pictureBoxApsisCampaign.Visible = false; 
      pictureBoxPushCampaign.Visible = true; 
      lblCampaignTypeDescription.Text = "Runs or schedules a campaign that sends a push notification to devices running an iOS or Android app."; 
      break; 
    } 
}

一切工作正常！但是我的lblCampaignTypeDescription的文本只有在SelectedIndex爲0時纔會更改，並且我得到一個空標籤。沒有異常拋出，我的調試遍歷了lblCampaignTypeDescription.Text。但沒有文字。案例1和2正確顯示文本。

有沒有人有過這個問題？還是我做了一些愚蠢的事情？

更新：

所有在我的項目lblCampaignTypeDescription引用：

private MetroFramework.Controls.MetroLabel lblCampaignTypeDescription; 

this.lblCampaignTypeDescription = new MetroFramework.Controls.MetroLabel(); 

this.metroTabPageSelectType.Controls.Add(this.lblCampaignTypeDescription); 

// 
// lblCampaignTypeDescription 
// 
this.lblCampaignTypeDescription.FontSize = MetroFramework.MetroLabelSize.Small; 
this.lblCampaignTypeDescription.FontWeight = MetroFramework.MetroLabelWeight.Regular; 
this.lblCampaignTypeDescription.Location = new System.Drawing.Point(121, 261); 
this.lblCampaignTypeDescription.Name = "lblCampaignTypeDescription"; 
this.lblCampaignTypeDescription.Size = new System.Drawing.Size(700, 18); 
this.lblCampaignTypeDescription.Style = MetroFramework.MetroColorStyle.Silver; 
this.lblCampaignTypeDescription.TabIndex = 11; 
this.lblCampaignTypeDescription.Text = "campaign_type_description"; 
this.lblCampaignTypeDescription.TextAlign = System.Drawing.ContentAlignment.MiddleCenter; 
this.lblCampaignTypeDescription.Theme = MetroFramework.MetroThemeStyle.Light; 
this.lblCampaignTypeDescription.UseStyleColors = true;

該標籤可從MetroFramework的Winform UI庫中的自定義標籤控制。但是我一直在使用它一百萬次，這是第一次發生這種情況。

來源

2015-09-09 Disasterkid

只要它應該按照設計工作。其他地方是否改變標籤上的文字？ –

你可以嘗試調用lblCampaignTypeDescription.Update（）;我不知道爲什麼你的解決方案無法正常工作。 – Bgl86

您的交換機在使用「默認」時會更好。文本屬性在所有情況下都無法更新？ – Bazinga

當您的SelectedIndex從1變爲0或2比0確實你lblCampaignTypeDescription.Text變化？嘗試顯示的selectedIndex先於其他actions.It應爲-1我根據您的代碼想

來源

2015-09-09 15:17:44

我做到了。我在'switch'語句之前添加了'lblCampaignTypeDescription.Text = metroComboBoxManualCampaignType.SelectedIndex.ToString（）;'行。值'0'完全不顯示。不知道毛刺在哪裏。 – Disasterkid

未在組合框的SelectedIndexChanged上設置標籤值（僅在一種情況下）

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