值不在预期范围内.(运行时错误)

本文关键字：运行时错误 范围内 | 更新日期: 2023-09-27 18:30:56

>我正在将Windows表单从VB转换为C#，当我尝试同步读取我的OPC标签时遇到了错误。

我有这个代码：

public partial class FrmPartialMain : Form
{   
    RsiOPCAuto.OPCServer oOpcServer;
    RsiOPCAuto.OPCGroup oOpcGroup;
    int ClHandle; //this is set to 1 in another part of the code.
    int SvHandle;

    int OpcDsCashe = 1;
    int OpcDsDevice = 2;
    private void cmdSyncRead_Click(object sender, EventArgs e)
    {
        int lNumItems = oOpcGroup.OPCItems.Count; // = 3
        int[] h = new int[lNumItems];
        Array arValues = new int[lNumItems];
        Array arHandles;
        Array arErrors;
        object Qualities;
        object Timestamps;

        h[ClHandle - 1] = oOpcGroup.OPCItems.Item(ClHandle).ServerHandle;  
        arHandles = (Array)h;
        //Error on the next line bellow.
        oOpcGroup.SyncRead((short)OpcDsDevice, lNumItems, ref arHandles, out arValues, out arErrors, out Qualities, out Timestamps);

        txtSubValue.Text = Convert.ToString(arValues.GetValue(0));
    }
}

oOpcGroup.Read（） 读取组中一个或多个项目的值、质量和时间戳信息。 返回类型如下所示：

 SyncRead(short Source, int NumItems, ref System.Array ServerHandles, out System.Array Values, out System.Array Errors, out object Qualities, out object TimeStamps);

运行此代码会给我标题中的错误，值不在预期范围内。对我在这里可能做错了什么有什么想法吗？

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值不在预期范围内.(运行时错误)

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这是固定代码：

public partial class FrmPartialMain : Form
{   
    RsiOPCAuto.OPCServer oOpcServer;
    RsiOPCAuto.OPCGroup oOpcGroup;
    int ClHandle; //this is set to 1 in another part of the code.
    int SvHandle;

    int OpcDsCashe = 1;
    int OpcDsDevice = 2;
    private void cmdSyncRead_Click(object sender, EventArgs e)                                                                                  //Sync Read
    {
        int lNumItems = oOpcGroup.OPCItems.Count;
        int[] arH = new int[1 + lNumItems];
        Array arValues = new object[1 + lNumItems]; //<-- This needed to be an object array.
        Array arHandles;
        Array arErrors;
        object Qualities;
        object Timestamps;
        arH[ClHandle] = oOpcGroup.OPCItems.Item(ClHandle).ServerHandle;
        arHandles = (Array)arH;
        oOpcGroup.SyncRead((short)OpcDsDevice, lNumItems, ref arHandles, out arValues, out arErrors, out Qualities, out Timestamps);
        txtSubValue.Text = Convert.ToString(arValues.GetValue(1));
    }
}
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