C# Visual Studio错误：从字符串转换日期和/或时间时转换失败

嗨，我是这个论坛的新成员。这是我的第一篇帖子，所以如果我做错了什么。。。 我有下面的代码。我收到了错误

从字符串转换日期和/或时间时，转换失败。visual studio

---

对查询中的所有参数使用正确的类型和SqlParameters

public void pay_fighter(
    string fighterID, 
    DateTime paymentDay, 
    decimal paymentAmount, 
    string paymentDescr)
{
    if (String.IsNullOrEmpty(fighterId))
    {
        return;
    }

    var query = 
        @"INSERT INTO PaymentInfo VALUES (
            @FighterId, 
            @PaymentDay, 
            @PaymentAmount, 
            @PaymentDescr)";
    var parameters = new[]
    {
        new SqlParameter
        {
            ParameterName = "@FigtherId",
            SqlDbType = SqlDbType.Int, // use correct type for column
            Value = fighterId
        },
        new SqlParameter
        {
            ParameterName = "@PaymentDay",
            SqlDbType = SqlDbType.DateTime, // use correct date type defined in column
            Value = paymentDay
        },
        new SqlParameter
        {
            ParameterName = "@PaymentAmount",
            SqlDbType = SqlDbType.Decimal, // use correct type for column
            Value = paymentAmount
        },
        new SqlParameter
        {
            ParameterName = "@PaymentDescr",
            SqlDbType = SqlDbType.VarChar, // use correct type for column
            Size = 100, // use size defined for column
            Value = paymentDescr
        }
    };

    using (var connection = new SqlConnection(connectionString))
    using (var command = new SqlCommand(query, connection))
    {
        command.Parameters.AddRange(parameters);

        connection.Open();
        command.ExecuteNonQuery();
    }
}

---

为查询创建新的SqlConnection实例将更安全。ADO.NET将处理实际/物理连接，并在需要时重用已创建的连接。

是SQL Server还是MySQL？请避免标记垃圾邮件。请在PaymentInfo table.Ah中发布列的数据类型。严格类型的代码。您知道VB.Net和SQL Server都有专为保存日期时间数据而设计的数据类型，而您在这里根本不使用它们？为什么每个输入参数都是字符串？

public void pay_fighter(
    string fighterID, 
    DateTime paymentDay, 
    decimal paymentAmount, 
    string paymentDescr)
{
    if (String.IsNullOrEmpty(fighterId))
    {
        return;
    }

    var query = 
        @"INSERT INTO PaymentInfo VALUES (
            @FighterId, 
            @PaymentDay, 
            @PaymentAmount, 
            @PaymentDescr)";
    var parameters = new[]
    {
        new SqlParameter
        {
            ParameterName = "@FigtherId",
            SqlDbType = SqlDbType.Int, // use correct type for column
            Value = fighterId
        },
        new SqlParameter
        {
            ParameterName = "@PaymentDay",
            SqlDbType = SqlDbType.DateTime, // use correct date type defined in column
            Value = paymentDay
        },
        new SqlParameter
        {
            ParameterName = "@PaymentAmount",
            SqlDbType = SqlDbType.Decimal, // use correct type for column
            Value = paymentAmount
        },
        new SqlParameter
        {
            ParameterName = "@PaymentDescr",
            SqlDbType = SqlDbType.VarChar, // use correct type for column
            Size = 100, // use size defined for column
            Value = paymentDescr
        }
    };

    using (var connection = new SqlConnection(connectionString))
    using (var command = new SqlCommand(query, connection))
    {
        command.Parameters.AddRange(parameters);

        connection.Open();
        command.ExecuteNonQuery();
    }
}