下面的方法很简单，对我来说很有效:

 bool hasMyColumn = (reader.GetSchemaTable().Select("ColumnName = 'MyColumnName'").Count() == 1);

正确的代码是:

public static bool HasColumn(DbDataReader Reader, string ColumnName) { 
    foreach (DataRow row in Reader.GetSchemaTable().Rows) { 
        if (row["ColumnName"].ToString() == ColumnName) 
            return true; 
    } //Still here? Column not found. 
    return false; 
}

public static bool DataViewColumnExists(DataView dv, string columnName)
{
    return DataTableColumnExists(dv.Table, columnName);
}

public static bool DataTableColumnExists(DataTable dt, string columnName)
{
    string DebugTrace = "Utils::DataTableColumnExists(" + dt.ToString() + ")";
    try
    {
        return dt.Columns.Contains(columnName);
    }
    catch (Exception ex)
    {
        throw new MyExceptionHandler(ex, DebugTrace);
    }
}

列。Contains不区分大小写。

你也可以调用GetSchemaTable()在你的DataReader上，如果你想要列的列表，你不想得到一个异常…

这对我来说很管用:

public static class DataRecordExtensions
{
    public static bool HasColumn(IDataReader dataReader, string columnName)
    {
        dataReader.GetSchemaTable().DefaultView.RowFilter = $"ColumnName= '{columnName}'";
        return (dataReader.GetSchemaTable().DefaultView.Count > 0);
    }
}

我的数据访问类需要向后兼容，所以我可能会尝试访问一个发行版中数据库中还不存在的列。我们有一些相当大的数据集要返回，所以我不太喜欢必须为每个属性迭代DataReader列集合的扩展方法。

我有一个实用程序类，它创建一个列的私有列表，然后有一个泛型方法，尝试基于列名和输出参数类型解析值。

private List<string> _lstString;

public void GetValueByParameter<T>(IDataReader dr, string parameterName, out T returnValue)
{
    returnValue = default(T);

    if (!_lstString.Contains(parameterName))
    {
        Logger.Instance.LogVerbose(this, "missing parameter: " + parameterName);
        return;
    }

    try
    {
        if (dr[parameterName] != null && [parameterName] != DBNull.Value)
            returnValue = (T)dr[parameterName];
    }
    catch (Exception ex)
    {
        Logger.Instance.LogException(this, ex);
    }
}

/// <summary>
/// Reset the global list of columns to reflect the fields in the IDataReader
/// </summary>
/// <param name="dr">The IDataReader being acted upon</param>
/// <param name="NextResult">Advances IDataReader to next result</param>
public void ResetSchemaTable(IDataReader dr, bool nextResult)
{
    if (nextResult)
        dr.NextResult();

    _lstString = new List<string>();

    using (DataTable dataTableSchema = dr.GetSchemaTable())
    {
        if (dataTableSchema != null)
        {
            foreach (DataRow row in dataTableSchema.Rows)
            {
                _lstString.Add(row[dataTableSchema.Columns["ColumnName"]].ToString());
            }
        }
    }
}

然后我可以像这样调用我的代码

using (var dr = ExecuteReader(databaseCommand))
{
    int? outInt;
    string outString;

    Utility.ResetSchemaTable(dr, false);        
    while (dr.Read())
    {
        Utility.GetValueByParameter(dr, "SomeColumn", out outInt);
        if (outInt.HasValue) myIntField = outInt.Value;
    }

    Utility.ResetSchemaTable(dr, true);
    while (dr.Read())
    {
        Utility.GetValueByParameter(dr, "AnotherColumn", out outString);
        if (!string.IsNullOrEmpty(outString)) myIntField = outString;
    }
}