变量的空参数

Question

我正在尝试使用PowerShell运行MySQL脚本并将输出转换为HTML文件或通过电子邮件发送输出。 但是我遇到了存储输出的变量的问题。

代码工作正常，因为我能够输出结果，它只是无法移动到HTML或电子邮件。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LibraryWork
{

    class Program
    {
        static void Main(string[] args)
        {
            var bookList = new List<string>();
            string ansSearch = String.Empty;
            string search = String.Empty;
            int i = 1;
            for (int zero = 0; i > zero; i++)
            {
                Console.Write("Type ");
                Console.ForegroundColor = ConsoleColor.Cyan;
                Console.Write("'New'");
                Console.ForegroundColor = ConsoleColor.White;
                Console.Write(" if you would you like to enter a new book. Type ");
                Console.ForegroundColor = ConsoleColor.Green;
                Console.Write("'List' ");
                Console.ForegroundColor = ConsoleColor.White;
                Console.Write("to see a list of books entered. Type ");
                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.Write("'Search' ");
                Console.ForegroundColor = ConsoleColor.White;
                Console.Write("to look up a specific book.");
                Console.Write(" And if you want to exit. Type ");
                Console.ForegroundColor = ConsoleColor.Red;
                Console.Write("'Stop'.");
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine();




                string answer = Console.ReadLine();

                if (answer == "Stop")
                {
                    return;
                }

                if (answer == "New")
                {
                    Console.Write("Please format the Entry of your book as follows: ");
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Write("'Name of the Book',");
                    Console.ForegroundColor = ConsoleColor.Blue;
                    Console.Write("'Author (first, last)',");
                    Console.ForegroundColor = ConsoleColor.DarkGreen;
                    Console.Write("'Category',");
                    Console.ForegroundColor = ConsoleColor.DarkYellow;
                    Console.Write("'Dewey Decimal Number'.");
                    Console.ForegroundColor = ConsoleColor.White;
                    Console.WriteLine();
                    bookList.Add("Entry " + i + ": " + Console.ReadLine());
                    continue;
                }
                if (answer == "List")
                {
                    bookList.ForEach(Console.WriteLine);
                    Console.WriteLine("Press enter to continue");
                    Console.ReadLine();
                    i--;
                    continue;
                }
                if (answer == "Search")
                {
                    Console.WriteLine("What would you like to search for (Title: Full Title; Author: first, last): ");
                    search = Console.ReadLine();
                    var results = bookList.Where(x => x.Contains(search)).ToList();
                    bool isEmpty = !results.Any();
                    if (isEmpty)
                    {
                        i--;
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.WriteLine("Sorry, we could not find that.");
                        Console.ForegroundColor = ConsoleColor.White;
                        continue;
                    }
                    foreach (var result in results)
                    {
                        Console.WriteLine(result);

                    }




                    Console.WriteLine("Press Enter to continue");
                    Console.ReadLine();
                    results.Clear();
                    i--;
                    continue;
                }
                i--;
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("Incorrect Response, please try again");
                Console.ForegroundColor = ConsoleColor.White;
            }

        }
    }

}

这是我得到的错误：

  

无法验证参数'Body'的参数。参数为null或空。提供非null或空的参数，然后再次尝试该命令。

似乎无法识别#The dataset must be created before it can be used in the script: $dataSet = New-Object System.Data.DataSet #MYSQL query $command = $myconnection.CreateCommand() $command.CommandText = " SELECT ID, Date_Close, Time_Close FROM systemcontrol.database_close WHERE Date_Close >= CONCAT(YEAR(NOW()), '-', MONTH(NOW()), '-01') AND Database_Close_ID = 1 ORDER BY Date_Close DESC "; Write-Host "4B - Sales Reports Month End Database" $reader = $command.ExecuteReader() #The data reader will now contain the results from the database query. #Processing the Contents of a Data Reader #The contents of a data reader is processes row by row: while ($reader.Read()) { #And then field by field: for ($i= 0; $i -lt $reader.FieldCount; $i++) { Write-Output $reader.GetValue($i).ToString() } } ConvertTo-Html -Body "$reader" -Title "4B - Sales Reports Month End Database" | Out-File C:\************.HTML Send-MailMessage -From " Daily Check <server@company.com>" -To "Admin <admin@admin>" -Subject "Daily Check: Server Times" -Body "$reader" -Priority High -Dno onSuccess, onFailure -SmtpServer 1.xx.xx.xx $myconnection.Close() 变量。我在哪里错了？

Answer 1

您正在将SqlDataReader对象传递给期望-body的{​​{1}}参数。只需在string[]数组中收集while循环中的值，然后将其传递给正文：

$result