C#查询SqlServer数据库并返回单个值的代码

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static public string GetSqlAsString(string sqlText,
                       SqlParameter[] sqlParameters,
                       string databaseConnectionString) {
    string result = "";
    SqlDataReader reader;
    SqlConnection connection = new SqlConnection(databaseConnectionString);
    using (connection) {
        SqlCommand sqlcommand = connection.CreateCommand();
        sqlcommand.CommandText = sqlText;
        if (sqlParameters != null) {
            sqlcommand.Parameters.AddRange(sqlParameters);
        }
        connection.Open();
        reader = sqlcommand.ExecuteReader();
        if (reader != null)
            if (reader.Read()) {
                result = reader.GetString(0);
            }
    }
    return result;
}    复制代码