C# 如果当前变量为空，如何跳到下一项

我有一个函数，它检索设备名列表，然后存储在变量中。然后，下一步是使用每行1个设备名称获取信息，并继续进行，直到循环完成

 String text = "";
        String errors = "";

    for (int i = 0; i < collection.Result.Count; i++)
    {
        deviceNames += collection.Result[i].DeviceName + Environment.NewLine;

        getvirtuals.Location = deviceNames;
        var virtuals = client.GetKnownVirtuals(getvirtuals, LtmKeyType.VirtualAddressPort);

        if (virtuals.Result == null)
        {
            i++;
            getvirtuals.Location = deviceNames;

        for (int v = 0; v < virtuals.Result.Count; v++)
                {
                try
                {
                    LtmKey virtualKey = new LtmKey();
                    virtualKey.Location = virtuals.Result[v].Location;
                    virtualKey.LocationType = virtuals.Result[v].LocationType;
                    virtualKey.Key = virtuals.Result[v].Key;
                    virtualKey.KeyType = LtmKeyType.VirtualAddressPort;

                    virtualKey.AdminGroup = admingroupComboBox.Text;


                    var memberStatus = client.GetMemberStatus(virtualKey);


                    for (int j = 0; j < memberStatus.Result.Count; j++)
                    {
                        VirtualMemberStatus status = memberStatus.Result[j];
                        text += String.Format("{5},{4},{0},{1},{2},{3}" + Environment.NewLine, status.Member.Address, status.Member.Port, status.EffectiveStatus, status.DesiredStatus, virtualKey.Key.Replace(":", ","), DateTime.UtcNow);
                        toolStripProgressBar1.PerformStep();
                    }
                }
                catch
                {
                    errors += String.Format("{0} Error Code: 2, Error occurred, check device name (case senstive) and admin group. This error may also occur due to connection loss, try again." + Environment.NewLine, DateTime.UtcNow);
                }
            }
            this.allResultsBox.Text = text;

        getallstatusButton.Enabled = true;
    }

    }

String text=”“；
字符串错误=”；
for（int i=0；i

---

我遇到的问题是，如果

virtuals

为null，工具就会崩溃，相反，我想做的是如果

virtuals=null

我想从列表中移到下一项。我尝试了一个

if语句，但它没有按计划工作，它仍然返回为null。
这似乎是一个问题：

if (virtuals.Result == null)
{
    i++;
    getvirtuals.Location = deviceNames;

    for (int v = 0; v < virtuals.Result.Count; v++)

    ...

然而，我怀疑你真的只是想：

// Keep going with the next iteration of the for loop
if (virtuals == null || virtuals.Results == null)
{
    continue;
}

如果您只想转到下一个循环迭代，如果virtuals为null，那么您需要
if（virtuals==null）继续

if (virtuals.Result == null)

做这个

if (virtuals == null)

插入以下内容如何：

  if(virtuals == null)
     continue;

就在队伍后面

  var virtuals = client.GetKnownVirtuals(getvirtuals, LtmKeyType.VirtualAddressPort);

您是否尝试过更换线路：

    if (virtuals.Result == null)

致：

如果这不能解决您的问题，那么您需要指出其他错误是什么

    if (virtuals.Result == null)

    if ((virtuals != null) && (virtuals.Result != null))