小编pur*_*ppc的帖子

如何检查是否XElement具有Record&INVID属性？我的函数只返回单个XElement.即

<INVENTORY>
  <Record>
    <INVID>1315</INVID>
    <INVNAME>TEST LOCATIONTEST</INVNAME>
    <HOSPNAME>TEST LOCATION</HOSPNAME>
    <INVTYPE>CLINICAL</INVTYPE>
    <INVDT>2013-09-30T09:30:00</INVDT>
    <INVDEF>YES</INVDEF>
    <INVACT>YES</INVACT>
    <UPDDTTM />
    <UPDUSR />
    <ENBREF>true</ENBREF>
    <INVPWD>101315</INVPWD>
  </Record>
</INVENTORY>


XElement xInventory = GetDefaultInventory();        
bool hasInventory = xInventory.Elements("INVID").Any();  //What to do here ? 

if (hasInventory)
{  
    //TO DO Some action 
}

我能够在WasapiLoopbackCapture（naudio）的帮助下捕获由扬声器生成的系统音频。但是问题是它捕获了wav文件，并且wav文件的大小很大（几乎10至15 MB / Min）。我必须捕获2-3小时的音频，这太高了。我正在寻找一种将WasapiLoopbackCapture捕获的wav流转换为MP3并将其保存到磁盘的解决方案。我尝试使用LAME.exe或其他解决方案，但未成功。任何有效的代码。

这是我的代码：

private void button1_Click(object sender, EventArgs e){
    LoopbackRecorder obj = new LoopbackRecorder();
    string a = textBox1.Text;
    obj.StartRecording(@"e:\aman.mp3");

}

public class LoopbackRecorder
{
    private IWaveIn _waveIn;
    private Mp3WaveFormat _mp3format;
    private WaveFormat _wavFormat;


    private WaveFileWriter _writer;
    private bool _isRecording = false;


    /// <summary>
    /// Constructor
    /// </summary>
    public LoopbackRecorder()
    {

    }

    /// <summary>
    /// Starts the recording.
    /// </summary>
    /// <param name="fileName"></param>
    public void StartRecording(string fileName)
    {
        // If we are currently record then go ahead and exit …

这是我的Circle类代码.

class Circle
{
    private double radius;
    private double area;

    public Circle(double radius)
    {
        this.radius = radius;
    }

    public double Area
    {
        set { area = Math.PI * Math.Pow(radius, 2); }
        get { return area; }

    }
}

这是测试代码.

    Circle circle1 = new Circle(3);

    MessageBox.Show("Circle 1 Area: " + circle1.Area);

所以出于某种原因,当我使用MessageBox.Show()时,它似乎给我的值为零.我给圆圈的值为3,所以我的构造函数不应该设置半径的值吗？

这是我的对象数组

Game[] gameConsoles = new Games[5];
// paramaters are name of the console and game ID
gameConsoles[0] = new Games("Playstation 4", 101);
gameConsoles[1] = new Games("Xbox 1", 108);
gameConsoles[2] = new Games("PS Vita", 110);
gameConsoles[3] = new Games("Wii U", 104);
gameConsoles[4] = new Games("3DS", 102);

for (int i = 0; i < gameConsoles.Length; i++)
{
    gameConsoles[i].display();
}

它基本上会在每个消息框中显示所有5个对象,但是我如何制作它以便它可以根据游戏ID顺序以升序显示它们？

我在排序常规数字时使用的排序算法.

public void ascendingOrder()
{
    // helper class
    double temp = 0;

    for (int j = 0; j < numbers.Length; j++)
    { …

我想在按钮单击时为Windows /系统设置设置默认打印机.我想点击一个按钮,并希望出现一个Windows对话框,要求用户设置默认打印机.现在我正在使用PrintDialog,但每次点击按钮都会更改打印机.我想将所选的打印机设置为默认打印机,即使我关闭应用程序也应该保持不变.

private void PrintSettingsBtn_Click(object sender, EventArgs e)
{
  PrintDialog PrintDialog = new PrintDialog();
  PrintDialog.ShowDialog();
  PrinterName = PrintDialog.PrinterSettings.PrinterName;
}

private void open(object sender, EventArgs e)
{         
    OpenFileDialog openDialog = new OpenFileDialog();

    if (openDialog.ShowDialog() == DialogResult.OK)
    {

        string[] lines = File.ReadAllLines(openDialog.FileName);

        foreach (string line in lines)
        {
            var text = line.Split(',', '\n');
            dataGridView1.Rows.Add(text);
        }

    }
}

所以在这段代码中我可以读取一个文本文件,但我只能像在1格一样.以下是示例文本文件的外观:

test,1,2,3,4,5,6,
testing,7,8,9,10,11,12,
working,13,14,15,16,17,18,
multiline,19,20,21,22,23,24,
NEXTDATA
see,25,26,36,46,56,66,
program,7,8,9,10,11,12,
macroer,13,14,15,16,17,18,
readextra,19,20,21,22,23,24,

因此,如果我到达名为"NEXTDATA"的行,我希望将数据放入其中dataGridView2.如何检查它是否到达该行,然后它将执行与代码相同的操作dataGridView1？

我也使用ReadLine()或ReadAllLines()？

我正在生成一个CSV文件,并尝试使用MVC将其发送到线路,但我一直得到Illegal characters in path异常.

我尝试过使用不同的方法,例如引用列,更改\n Environment.NewLine但是问题的原因仍然无法解决.

控制器代码:

string csv = "";
csv = "Name, Sales, Qty, Cost, Profit" + "\n";
foreach (var item in model.ReportResults.Items) {
    csv += item.ToCsv();
}

return File(csv, "text/csv", "myfile.csv");

ToCsv方法:

internal string ToCsv() 
{
    return "" + Name + "" + "," + Sales.ToString() + "," + Qty.ToString() + "," + Cost.ToString() + "," + Profit.ToString() + "\n";
}

生成的CSV文件的快照:

Name, Sales, Qty, Cost, Profit
Tyranids,4979.29,182,3375.00,1604.29
Space Marines,2127.88,87,948.09,1179.79
Tau Empire,1584.01,40,0.00,1584.01
Eldar,1164.04,44,925.38,238.66
Imperial …

以下代码中的错误在哪里？已经有一个与此命令关联的打开的DataReader,必须先关闭它.

"执行命令定义时发生错误.有关详细信息,请参阅内部异常."

var cat = from c in db.Question select c;
foreach (Questions question in cat) {
    Console.WriteLine("{0}", question.tittle);
    Console.WriteLine("{0}", question.deskripsi);
    Console.WriteLine("{0}", question.id_question);
    **foreach (Categories p in question.Categories)**
    {
        Console.WriteLine("{0}", p.id_kategori);
        Console.WriteLine("{0}", p.nama_kategori);
    }
}

我需要使用以下语法了解DateTime值的大小参数：

adapter.InsertCommand.Parameters.Add("@deliveryDateAndTime", SqlDbType.DateTime,10,"deliveryDateAndTime");

我无法使用以下语法，因为我正在将更新批处理在数据表中。

adapter.InsertCommand.Parameters.Add("@deliveryDateAndTime", SqlDbType.DateTime);
adapter.InsertCommand.Parameters["@deliveryDateAndTime"] = *variable*.value;

以下是我需要使用的代码（为清楚起见，已缩写）。请注意，在adapter.InsertCommand.Parameters.Add("@deliveryDateAndTime", SqlDbType.DateTime,10,"deliveryDateAndTime");语句内部，第一个参数引用对应的SQL参数，第四个参数对应于数据表中该值的数据。

DataTable dt = new DataTable();
foreach (FuelDelivery fd in fuelDelivery.FuelDeliveries)
{
    DataRow dr = dt.NewRow();
    dr["deliveryDateAndTime"] = fd.DeliveryDateAndTime;
    dt.Rows.Add(dr);
}

using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["HHSqlConnection"].ToString()))
{
    // Create a SqlDataAdapter.
    SqlDataAdapter adapter = new SqlDataAdapter();

    // Set the INSERT command and parameter.
    adapter.InsertCommand.Parameters.Add("@deliveryDateAndTime", SqlDbType.DateTime,10,"deliveryDateAndTime");
    adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;

    // Set the batch size. Zero represents the maximum amt …

这是表及其值：

CREATE TABLE Weapon(id INT,
Name VARCHAR(80),
Style VARCHAR(80));

Insert into Weapon values (1, 'Seismic Wand', 'Magic');
Insert into Weapon values (2, 'Nox Bow', 'Ranged');
Insert into Weapon values (3, 'Drygore', 'Melee');
Insert into Weapon values (4, 'Chaotic Staff', 'Magic');
Insert into Weapon values (5, 'Staff of Darkness', 'Magic');
Insert into Weapon values (6, 'Tetsu Katana', 'Melee');

这是我的查询尝试。

SELECT Name, Count(*) AS Style
FROM Weapon
GROUP BY Name
HAVING Count(*) >= ALL
   (SELECT Count(*)
   FROM Weapon
   GROUP BY Name);

它不显示模式， …