Question

代码用户未处理TypeInitializationException

应该是红字那里的错误，但是因为初学的关系，我看不太明白，有高手帮忙看看下面代码哈，谢谢。O(∩_∩)O

【代码用户未处理TypeInitializationException
“sqlHelp”的类型初始值设定项引发异常。”】

/// <summary>
/// 数据库服务助手类
/// </summary>
public class sqlHelp
{
public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["stdInfoConnectionString"].ConnectionString;
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之后的引用是：
string bcId = e.Keys[0].ToString();
string sql = "select count(*) from [bookInfo] where [bcid]=@bcId";
SqlParameter[] param ={ new SqlParameter("@bcid", SqlDbType.VarChar) };
param[0].Value = bcId;
int count = (int)sqlHelp.ExecuteScalar(sqlHelp.ConnectionStringLocalTransaction, CommandType.Text, sql, param); if (count > 0)
{
Response.Write("该分类下存在图书信息不能删除！");
e.Cancel=true;
}

Answer 1

(int)sqlHelp.ExecuteScalar(sqlHelp.ConnectionStringLocalTransaction, CommandType.Text, sql, param);

核对一下每个参数是否都正确，符合要求