c# - 编译器错误消息 : CS1519: Invalid token '=' in class, 结构或接口(interface)成员声明

Question

我一直遇到以下编译错误:

            Compilation Error

            Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

            Compiler Error Message: CS1519: Invalid token '=' in class, struct, or interface member declaration

            Source Error:


              Line 22:              
              Line 23:  //Assign a Connection String
              Line 24:  conn.ConnectionString = ConfigurationManager.ConnectionStrings["sauceatronConnString"].ConnectionString;
              Line 25:          
              Line 26:  //Connection Open   

              Source Line: 24 

只是想用一般的编程新知识以及 ASP 和 C# 作为序言。我之前使用相同的代码连接到数据库并且它工作正常但现在我遇到了那个我不太熟悉如何解决的错误。下面是我的 aspx 页面和我的 web.config 的代码。

            <%@Page Language="C#" MasterPageFile="MasterPage/AtronsSiteMaster.master"%>
            <%@ Import Namespace="System.Data"%>
            <%@ Import Namespace="System.Data.Common"%>
            <%@ Import Namespace="System.Data.OleDb"%>
             <%@ Import Namespace="System.Configuration"%>
            <%@ Import Namespace="System.Collections.Generic"%>

            <asp:Content ContentPlaceHolderID="titleContentPlaceHolder" ID="titleContent" runat="server">Products</asp:Content>

           <asp:Content ContentPlaceHolderID="headContentPlaceHolder" ID="headContent" runat="server"></asp:Content>

             <script runat="server" language="C#">

                    String provider = ConfigurationManager.ConnectionStrings["sauceatronConnString"].ProviderName;

                    DbProviderFactory factory = DbProviderFactories.GetFactory(provider);

                    //Open a Connection
                    DbConnection conn = factory.CreateConnection();

                    //Assign a Connection String
                    conn.ConnectionString = ConfigurationManager.ConnectionStrings["sauceatronConnString"].ConnectionString;

                    //Connection Open
                    conn.Open();

                    //Initialize a Command
                    DbCommand comm = conn.CreateCommand();

                    //Tell the command which connection it will use
                    comm.Connection = conn;

                    //Give the command SQL to execute
                    comm.CommandText = "Select ProductName,ProductIssue,Writer,UnitPrice from Products order by ProductName, ProductIssue";

                    //Execute the command and get back the results via a reader
                    DbDataReader reader = comm.ExecuteReader();

                    //While we get results from the DB, add a row to the Table
                    while (reader.Read())
                    {
                        TableRow row = new TableRow();
                        TableCell cell;

                        cell = new TableCell();
                        cell.Text = reader["ProductName"].ToString();
                        row.Cells.Add(cell);

                        cell = new TableCell();
                        cell.Text = reader["ProductIssue"].ToString();
                        row.Cells.Add(cell);

                        cell = new TableCell();
                        cell.Text = reader["Writer"].ToString();
                        row.Cells.Add(cell);

                        cell = new TableCell();
                        cell.Text = reader["UnitPrice"].ToString();
                        row.Cells.Add(cell);
                    }

                    //Free up the connection
                    conn.Close();

                </script>

                <asp:Content ContentPlaceHolderID="pageTitleContentPlaceHolder" ID="pageTitleContent" runat="server">Products</asp:Content>

                <asp:Content ContentPlaceHolderID="mainContentPlaceHolder" ID="mainContent" runat="server">
                    <asp:Table ID="tblData" runat="server">
                        <asp:TableHeaderRow>
                            <asp:TableHeaderCell>Comic Book Name</asp:TableHeaderCell>
                            <asp:TableHeaderCell>Issue</asp:TableHeaderCell>
                            <asp:TableHeaderCell>Writer Name</asp:TableHeaderCell>
                            <asp:TableHeaderCell>Price</asp:TableHeaderCell>
                        </asp:TableHeaderRow>
                    </asp:Table>
             </asp:Content> 

            <configuration>
                   <system.web>
                     <customErrors mode="Off"/>
                    <compilation debug="true"/>
                 </system.web>



                   <connectionStrings>
                            <add name="databaseConnString" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=~\Database\database.accdb;Persist Security Info=False;" providerName="System.Data.OleDb"/>
                            <add name="studentConnString" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=~\Database\students.mdb;Persist Security Info=False;" providerName="System.Data.OleDb"/>
                            <add name="sauceatronConnString" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=~\finals\Database\SauceAtronsVault.accdb;Persist Security Info=False;" providerName="System.Data.OleDb"/>
                   </connectionStrings>

              </configuration>

Answer 1

此错误是由于您的 MSBuild 版本问题而发生的，旧版本的 MSBuild 只能编译 C# 版本 4，而您的代码以 C# 版本 6 格式编写。

C# version 6 代码编写示例:

 public static string HostName { get; set; } = ConfigurationManager.AppSettings["RabbitMQHostName"] ?? "";

要让 MSBuild 编译您的代码，您需要使用 C# 4 风格编写

public static string HostName { get; set; }
public SomeConstructor()
        {
            Host = ConfigurationManager.AppSettings["RabbitMQHostName"] ?? "";... }