如何绑定列表到dataGridView？ [英] How to bind list to dataGridView?

问题描述

我似乎在圈子里跑来跑去，在最后几个小时里一直这样做。

我想从一个字符串数组中填充一个datagridview。我已经看到它不可能直接，我需要创建一个自定义类型，将该字符串作为一个公共属性。所以我做了一个类：

  public class FileName 
 {
 private string _value; 
 
 public FileName（string pValue）
 {
 _value = pValue; 
} 
 
 public string Value 
 {
 get 
 {
 return _value; 
} 
 set {_value = value; } 
} 
} 
  

这是容器类，它只有具有字符串值的属性。我现在想要的是，当我将其数据源绑定到列表时，该字符串将出现在datagridview中。

另外我有这个方法，BindGrid（），我想填充datagridview。这里是：

  private void BindGrid（）
 {
 gvFilesOnServer.AutoGenerateColumns = false; 
 
 //以编程方式创建列
 DataGridViewTextBoxColumn colFileName = new DataGridViewTextBoxColumn（）; 
 DataGridViewCell cell = new DataGridViewTextBoxCell（）; 
 colFileName.CellTemplate = cell; colFileName.Name =Value; 
 colFileName.HeaderText =文件名; 
 colFileName.ValueType = typeof（FileName）; 
 
 //将列添加到datagridview 
 gvFilesOnServer.Columns.Add（colFileName）; 
 
 //填充字符串数组
 string [] filelist = GetFileListOnWebServer（）; 
 
 //尝试制作列表< FileName>从该数组
列表< FileName> filenamesList = new List< FileName>（filelist.Length）; （int i = 0; i< filelist.Length; i ++）
 {
 filenamesList.Add（new FileName（filelist [i] .ToString（）））; 
 
} 
 
 //尝试制作一个绑定源
 BindingSource bs = new BindingSource（）; 
 bs.DataSource = typeof（FileName）; 
 foreach（FileName fn in filenamesList）
 {
 bs.Add（fn）; 
} 
 gvFilesOnServer.DataSource = bs; 
} 
  

最后，问题：字符串数组填满，列表创建好，但我在datagridview中得到一个空列。我也直接尝试了datasource = list<>，而不是= bindingsource，仍然没有。

我真的很感激一个建议，这一直使我疯狂。 >

谢谢

解决方案

使用 BindingList 并设置 DataPropertyName - 列的属性。

尝试以下操作： / p>

  ... 
 private void BindGrid（）
 {
 gvFilesOnServer.AutoGenerateColumns = false; 
 
 //以编程方式创建列
 DataGridViewCell cell = new DataGridViewTextBoxCell（）; 
 DataGridViewTextBoxColumn colFileName = new DataGridViewTextBoxColumn（）
 {
 CellTemplate = cell，
 Name =Value，
 HeaderText =File Name，
 DataPropertyName =Value//告诉列哪个FileName的属性应该使用
}; 
 
 gvFilesOnServer.Columns.Add（colFileName）; 
 
 var filelist = GetFileListOnWebServer（）。ToList（）; 
 var filenamesList = new BindingList< FileName>（filelist）; //<  -  BindingList 
 
 //将BindingList直接绑定到DataGrid，不需要BindingSource 
 gvFilesOnServer.DataSource = filenamesList 
} 
  

I seem to be running around in circles and have been doing so in the last hours.

I want to populate a datagridview from an array of strings. I've read its not possible directly, and that I need to create a custom type that holds the string as a public property. So I made a class:

public class FileName
    {
        private string _value;

        public FileName(string pValue)
        {
            _value = pValue;
        }

        public string Value
        {
            get 
            {
                return _value;
            }
            set { _value = value; }
        }
    }

this is the container class, and it simply has a property with the value of the string. All I want now is that string to appear in the datagridview, when I bind its datasource to a List.

Also I have this method, BindGrid() which I want to fill the datagridview with. Here it is:

    private void BindGrid()
    {
        gvFilesOnServer.AutoGenerateColumns = false;

        //create the column programatically
        DataGridViewTextBoxColumn colFileName = new DataGridViewTextBoxColumn();
        DataGridViewCell cell = new DataGridViewTextBoxCell();
        colFileName.CellTemplate = cell; colFileName.Name = "Value";
        colFileName.HeaderText = "File Name";
        colFileName.ValueType = typeof(FileName);

        //add the column to the datagridview
        gvFilesOnServer.Columns.Add(colFileName);

        //fill the string array
        string[] filelist = GetFileListOnWebServer();

        //try making a List<FileName> from that array
        List<FileName> filenamesList = new List<FileName>(filelist.Length);
        for (int i = 0; i < filelist.Length; i++)
        {
            filenamesList.Add(new FileName(filelist[i].ToString()));
        }

        //try making a bindingsource
        BindingSource bs = new BindingSource();
        bs.DataSource = typeof(FileName);
        foreach (FileName fn in filenamesList)
        {
            bs.Add(fn);
        }
        gvFilesOnServer.DataSource = bs;
    }

Finally, the problem: the string array fills ok, the list is created ok, but I get an empty column in the datagridview. I also tried datasource= list<> directly, instead of = bindingsource, still nothing.

I would really appreciate an advice, this has been driving me crazy.

Thank you

解决方案

Use a BindingList and set the DataPropertyName-Property of the column.

Try the following:

...
private void BindGrid()
{
    gvFilesOnServer.AutoGenerateColumns = false;

    //create the column programatically
    DataGridViewCell cell = new DataGridViewTextBoxCell();
    DataGridViewTextBoxColumn colFileName = new DataGridViewTextBoxColumn()
    {
        CellTemplate = cell, 
        Name = "Value",
        HeaderText = "File Name",
        DataPropertyName = "Value" // Tell the column which property of FileName it should use
     };

    gvFilesOnServer.Columns.Add(colFileName);

    var filelist = GetFileListOnWebServer().ToList();
    var filenamesList = new BindingList<FileName>(filelist); // <-- BindingList

    //Bind BindingList directly to the DataGrid, no need of BindingSource
    gvFilesOnServer.DataSource = filenamesList 
}

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