C# 数据表中缺少主键

当我运行以下代码从

DataTable

获取值时，我得到一个错误

System.Data.dll中发生“System.Data.MissingPrimaryKeyException”类型的异常，但未在用户代码中处理

我不知道原因和如何修复它。我得到的错误是

if (csvData.Rows.Find(args.BluetoothAddress.ToString()) != null)

我的完整代码：

string csv_file_path = @"C: \Users\xxx\Desktop\xxxx.csv";

DataTable csvData;
.....

DataColumn[] primaryKeys;

primaryKeys = csvData.PrimaryKey;
.....

private void Watcher_Received(BluetoothLEAdvertisementWatcher sender, BluetoothLEAdvertisementReceivedEventArgs args)
{
    if (args.RawSignalStrengthInDBm > -100)
    {
        if (csvData.Rows.Find(args.BluetoothAddress.ToString()) != null) 
                  // got the error
        {
            DataRow infoRow = csvData.Rows.Find(args.BluetoothAddress.ToString());

            if (infoRow[1] != null)
            {
                // Display Location information
                this.Dispatcher.Invoke((Action)(() =>
                                { textBox.Text = ("Location: "    + infoRow[2].ToString() + ", Time: " + DateTime.Now.ToString("h:mm:ss tt")).ToString(); }));

            }
            else
            {
                // record other information
                ........
            }
        }
    }
}

---

当表没有主键时，将引发

MissingPrimaryKeyException

要在

数据行集合上执行
查找
，需要在
数据表上定义
，请尝试定义主键，如下例所示

DataColumn column1=... ; // Table column
csvData.PrimaryKey = new DataColumn[] {column1};

当表没有主键时，将引发
MissingPrimaryKeyException

要在
数据行集合上执行
查找
，需要在
数据表上定义
，请尝试定义主键，如下例所示

DataColumn column1=... ; // Table column
csvData.PrimaryKey = new DataColumn[] {column1};

您忘记设置应被视为数据表中主键的列或列组。以下是您如何做到这一点：

    DataTable csvData = new DataTable();
    DataColumn idCol = new DataColumn("Id",typeof(int));
    //column should be already added into the column list of datatable before setting it as primary key
    csvData.Columns.Add(idCol);
    //set the primary key. Here you can add multiple columns as it is a array property. This fixes your error
    csvData.PrimaryKey = new[] { idCol };

    DataColumn[] primaryKeys;

    primaryKeys = csvData.PrimaryKey;
    //if you do not set the primary key the below count was earlier coming out to be zero.
    var count = primaryKeys.Length;

您忘记设置应被视为数据表中主键的列或列组。以下是您如何做到这一点：

    DataTable csvData = new DataTable();
    DataColumn idCol = new DataColumn("Id",typeof(int));
    //column should be already added into the column list of datatable before setting it as primary key
    csvData.Columns.Add(idCol);
    //set the primary key. Here you can add multiple columns as it is a array property. This fixes your error
    csvData.PrimaryKey = new[] { idCol };

    DataColumn[] primaryKeys;

    primaryKeys = csvData.PrimaryKey;
    //if you do not set the primary key the below count was earlier coming out to be zero.
    var count = primaryKeys.Length;

您能指出引发异常的行吗？if（csvData.Rows.Find（args.BluetoothAddress.ToString（））！=null）。此行出错。您能指出引发异常的行吗？if（csvData.Rows.Find（args.BluetoothAddress.ToString（））！=null）。这条线出错了。