当 datagridview 选择中存在 NUL 字符时，为什么复制粘贴不起作用？

Question

如果存在 "NUL" 个字符（即 ASCII 代码 = 0），为什么任何形式的 copy/paste datagridview 都不起作用？如果数据中存在 "NUL" 个字符，datagridview 会将它们显示为空格，但不会复制（或至少不会粘贴）超出它们的实例。我不确定我是否发现了错误，或者我只是不理解剪贴板/copy/paste 的行为。手动 copy/paste 和编程方法都产生相同的结果。如果手动 selects，它会出现 select 多行，但是当粘贴时，只会粘贴第一个 "NUL" 字符之前的数据。该行和所有其他行上的其余数据未粘贴。

None 的 row/edit 设置似乎很重要。在单元格中生成数据的方法似乎并不重要。我搜索了 Google 和 S.O。对于一个没有用的答案。是的，我确实看到了 S.O。帖子 Copy string data with NULL character inside string to char array and NULL in a string can't copy contents after NUL 和一些类似的帖子 none 回答了这个问题——它们只提供涉及替换 NUL 字符的解决方法。我希望能理解 "why" 并找到 copy/paste 包括 NUL 字符的方法。

我创建了一个纯测试场景。抱歉，如果我包含了太多内容。我不完全确定 required/relevant 是什么，所以我犯了太多的错误。

using System;
using System.Data;
using System.Windows.Forms;

namespace GQ
{
    public partial class frmTestOfDataGrid : Form
    {
        public frmTestOfDataGrid()
        {
            InitializeComponent();
        }

        private void buttonRunTest_Click(object sender, EventArgs e)
        { 
            BindingSource myBindingSource = new BindingSource();
            myBindingSource.DataSource = CreateTestDataTable();
            dataGridView1.DataSource = myBindingSource;
            dataGridView1.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells);
        }
        private DataTable CreateTestDataTable()
        {
            char Nul = (char)0;
            string myTestString1 = "The Nul characters are between these >" + Nul + Nul + "< and you can't copy anything after them.";
            string myTestString2 = "Second line of test data will not end up being copied to clipboard if above Nul characters are included in selection.";
            DataTable tbl = new DataTable();
            tbl.Columns.Add("RowIndex", typeof(Int32));
            tbl.Columns.Add("RowValue", typeof(String));
            DataRow dr1 = tbl.NewRow();
            dr1[0] = 0;
            dr1[1] = myTestString1;
            tbl.Rows.Add(dr1);
            DataRow dr2 = tbl.NewRow();
            dr2[0] = 1Y;
            dr2[1] = myTestString2;
            tbl.Rows.Add(dr2);
            return tbl;
        }

        private void buttonCopyToClipboard_Click(object sender, EventArgs e)
        {
            if (this.dataGridView1
                .GetCellCount(DataGridViewElementStates.Selected) > 0)
            {
                Clipboard.SetDataObject(this.dataGridView1.GetClipboardContent());
            }
        }
    }
}
namespace GQ
{
    partial class frmTestOfDataGrid
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.dataGridView1 = new System.Windows.Forms.DataGridView();
            this.buttonRunTest = new System.Windows.Forms.Button();
            this.buttonCopyToClipboard = new System.Windows.Forms.Button();
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
            this.SuspendLayout();
            // 
            // dataGridView1
            // 
            this.dataGridView1.AllowUserToAddRows = false;
            this.dataGridView1.AllowUserToDeleteRows = false;
            this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Location = new System.Drawing.Point(10, 43);
            this.dataGridView1.Name = "dataGridView1";
            this.dataGridView1.ReadOnly = true;
            this.dataGridView1.Size = new System.Drawing.Size(963, 313);
            this.dataGridView1.TabIndex = 0;
            // 
            // buttonRunTest
            // 
            this.buttonRunTest.Location = new System.Drawing.Point(753, 371);
            this.buttonRunTest.Name = "buttonRunTest";
            this.buttonRunTest.Size = new System.Drawing.Size(146, 27);
            this.buttonRunTest.TabIndex = 1;
            this.buttonRunTest.Text = "Run Test";
            this.buttonRunTest.UseVisualStyleBackColor = true;
            this.buttonRunTest.Click += new System.EventHandler(this.buttonRunTest_Click);
            // 
            // buttonCopyToClipboard
            // 
            this.buttonCopyToClipboard.Location = new System.Drawing.Point(753, 403);
            this.buttonCopyToClipboard.Name = "buttonCopyToClipboard";
            this.buttonCopyToClipboard.Size = new System.Drawing.Size(146, 27);
            this.buttonCopyToClipboard.TabIndex = 2;
            this.buttonCopyToClipboard.Text = "Then Copy To Clipboard";
            this.buttonCopyToClipboard.UseVisualStyleBackColor = true;
            this.buttonCopyToClipboard.Click += new System.EventHandler(this.buttonCopyToClipboard_Click);
            // 
            // frmTestOfDataGrid
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(976, 442);
            this.Controls.Add(this.buttonCopyToClipboard);
            this.Controls.Add(this.buttonRunTest);
            this.Controls.Add(this.dataGridView1);
            this.Name = "frmTestOfDataGrid";
            this.Text = "frmTestOfDataGrid";
            ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
            this.ResumeLayout(false);
        }

        #endregion

        private System.Windows.Forms.DataGridView dataGridView1;
        private System.Windows.Forms.Button buttonRunTest;
        private System.Windows.Forms.Button buttonCopyToClipboard;
    }
}

Answer 1

(char)0 或 '\0' 基本上是字符串的结尾。这就是为什么 copy 不会拿走之后的任何东西。

我在你的句子中换行显示两个字符

而且从网格来看，还是可以copy/paste的。

('\0')的用法很不寻常，我很想知道使用它的原因是什么？

您可以在 Why do we need to add a '[=13=]' (null) at the end of a character array in C?

上看到讨论

当 datagridview 选择中存在 NUL 字符时，为什么复制粘贴不起作用？

Why won't copy paste work when NUL character is present in datagridview selection?

c#

datagridview

copy-paste

winforms

nul