BindingSource.Find键比较是不区分大小写的？

Question

我使用BindingSource.Find（）在刷新DataGridView后返回用户的位置。我使用BindingSource.Find（）和一个RowID作为我正在搜索的DataColumn。不幸的是，Oracle可以返回两个不同的RowID。

BindingSource.Find（）返回第一个匹配，无论大小写。

望着MSDN文档：

public int Find(string propertyName, Object key) 

它说，propertyName的比较是不区分大小写的，但没有提及键比较是否是。

有谁知道如何使BindingSource.Find区分大小写？

Answer 1

对于DataView您需要做的就是将父DataTable的CaseSensitive属性设置为true。我只是快速原型与下面的代码，它工作正常：

public Form1() 
{ 
    InitializeComponent(); 

    DataSet set1 = new DataSet(); 

    // Some xml data to populate the DataSet with. 
    string testXml = 
    "<?xml version='1.0' encoding='UTF-8'?>" + 
    "<numbers>" + 
    "<number><name>one</name></number>" + 
    "<number><name>two</name></number>" + 
    "<number><name>Two</name></number>" + 
    "<number><name>three</name></number>" + 
    "</numbers>"; 

    // Read the xml. 
    StringReader reader = new StringReader(testXml); 
    set1.ReadXml(reader); 

    // Get a DataView of the table contained in the dataset. 
    DataTableCollection tables = set1.Tables; 
    // Set the CaseSensetive property 
    tables[0].CaseSensitive = true; 
    DataView view1 = new DataView(tables[0]); 

    // Create a DataGridView control and add it to the form.    
    dataGridView1.AutoGenerateColumns = true;    

    // Create a BindingSource and set its DataSource property to 
    // the DataView. 
    BindingSource source1 = new BindingSource(); 
    source1.DataSource = view1; 

    // Set the data source for the DataGridView. 
    dataGridView1.DataSource = source1; 

    // Set the Position property to the results of the Find method. 
    int itemFound = source1.Find("name", "Two"); 
    source1.Position = itemFound; 
} 

对于需要其他类型的IBindingList的，作为文档说，它实现了一个查找区分大小写的基础列表。对于完整性我展示的代码做下面这个样子：

public Form1() 
{ 
    InitializeComponent(); 

    // This uses my CaseSensitiveBindingList which I have code for later 
    BindingList<DGVItems> source = new CaseSensitiveBindingList<DGVItems>() 
     { 
      new DGVItems { Number = "one" }, 
      new DGVItems{Number = "two"}, 
      new DGVItems{Number = "Two"} 
     }; 

    BindingSource bindingSource = new BindingSource(); 
    bindingSource.DataSource = source; 

    dataGridView1.DataSource = bindingSource; 

    var index = bindingSource.Find("Number", "Two"); 

    // Index is 2 (third item) as desired. 
    MessageBox.Show(number.ToString()); 

} 

public class DGVItems 
{ 
    public string Number { get; set; } 
} 

而对于CaseSensitiveBindingList代码：

public class CaseInsensitiveBindingList<T> : BindingList<T> 
{ 
    protected override int FindCore(PropertyDescriptor prop, object key) 
    { 
     string stringKey = key as string;    

     bool keyIsString = stringKey != null; 

     for (int i = 0; i < Count; ++i) 
     { 
      if (keyIsString && prop.PropertyType.IsAssignableFrom(typeof(string))) 
      { 
       if (stringKey.Equals(prop.GetValue(Items[i]).ToString(), StringComparison.CurrentCulture)) 
        return i; 
      } 
      else 
      { 
       if (key.Equals(prop.GetValue(Items[i]))) 
        return i;  
      } 

     } 

     return -1; 
    } 
} 

该代码几乎肯定能够改善，但显示的一般概念。