Question

我是C＃的初学者，当我执行代码时，会出现以下错误消息：

“发生了'System.Data.SqlClient.SqlException'类型的异常   System.Data.dll但未在用户代码中处理

其他信息：'b'附近的语法不正确

我的代码：

const webpack = require('webpack');
const path = require('path');
const NpmInstallPlugin = require('npm-install-webpack-plugin');

const PATHS = {
    app: path.join(__dirname, 'resources/assets/js'),
    publicPath: path.join(__dirname, 'public')
};

module.exports = {
    entry: [
        "webpack-dev-server/client?http://localhost:4444",
        "webpack/hot/dev-server",
        PATHS.app
    ],
    output: {
        path: PATHS.publicPath,
        publicPath: '/js/',
        filename: 'bundle.js'
    },
    module: {
        loaders: [
            {
                test: /\.jsx?$/,
                loader: "react-hot",
                exclude: /node_modules/
            },
            {
                test: /\.jsx?$/,
                include: PATHS.app,
                loader: 'babel-loader',
                query: {
                    presets: ['react', 'es2015', 'stage-0', 'react-hmre'], // set of plugins out of the box
                    plugins: ['react-html-attrs', 'transform-class-properties', 'transform-decorators-legacy']
                }
            }
        ]
    },
    devtool: 'eval-source-map',
    devServer: {
        contentBase: PATHS.publicPath,
        historyApiFallback: true,
        hot: true,
        inline: true,
        progress: true,
        noInfo: false,
        stats: 'errors-only',
        host: process.env.HOST,
        port: 4444,
        proxy: {
            "/api/*": "http://127.0.0.1:8000/"
        }
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new NpmInstallPlugin({
            save: true
        })
    ]
};

我的数据库有三个表：

public void populateIngredients() { string query = "select a.Name from Ingredients a" + "inner join RecipeIngredient b ON a.Id = b.IngredientID" + "where b.RecipeID = @RecipeID"; using (con = new SqlConnection(connection)) using (SqlCommand cmd = new SqlCommand(query,con)) using (SqlDataAdapter sda = new SqlDataAdapter(cmd)) { cmd.Parameters.AddWithValue("@RecipeID", listRecipes.SelectedValue); DataTable IngredientTable = new DataTable(); sda.Fill(IngredientTable); // The error points here listIngredients.DisplayMember = "Name"; listIngredients.ValueMember = "Id"; listIngredients.DataSource = IngredientTable; } }（身份证，姓名，准备时间，说明）
Recipe（身份证，姓名）
Ingredients（Id，RecipeID，IngredientID）

Answer 1

缺少某些单词之间的空格！放一个空间＆＃34; ＆＃34;每个字符串常量的第一个。你的字符串查询现在是这样的：
"select a.Name from Ingredients ainner join RecipeIngredient b ON a.Id = b.IngredientID" +

且a和inner字之间没有空格。

例外：'System.Data.SqlClient.SqlException'发生在System.Data.dll中，但未在用户代码中处理

1 个答案: