无法将类型'int'隐式转换为'字符串'。我不能

Question

我有一个简单的问题。 dizi是一个字符串数组。我无法对int进行数字排序。我想排序为数组数组。

string[] dizi = new string[40]; 

for (int i = 0; i < listBox1.Items.Count; i++) { 
    dizi[i] = listBox1.Items[i].ToString(); 
} 

Array.Sort(dizi); 
label2.Text = dizi[0]; 

Answer 1

我想你想要的是将它们放入一个Array到listbox项目进行排序，但在同一时间，你也改变了listbox项目进入string和string阵列无法通过升/降作为int确实

在这种情况下进行排序，你倒是应该让你[R listbox项目为intArray，然后在你的Label显示它作为string

int[] dizi = new int[listBox1.Items.Count]; //here is int array instead of string array, put generic size, just as many as the listBox1.Items.Count will do 
for (int i = 0; i < listBox1.Items.Count; i++) { 
    dizi[i] = Convert.ToInt32(listBox1.Items[i].ToString()); 
    //assuming all your listBox1.Items is in the right format, the above code shall work smoothly, 
    //but if not, use TryParse version below: 
    // int listBoxIntValue = 0; 
    // bool isInt = int.TryParse(listBox1.Items[i].ToString(), out listBoxIntValue); //Try to parse the listBox1 item 
    // if(isInt) //if the parse is successful 
    //  dizi[i] = listBoxIntValue; //take it as array of integer element, rather than string element. Best is to use List though 
    //here, I put the safe-guard version by TryParse, just in case the listBox item is not necessarily valid number. 
    //But provided all your listBox item is in the right format, you could easily use Convert.ToInt32(listBox1.Items[i].ToString()) instead 
} 

Array.Sort(dizi); //sort array of integer 
label2.Text = dizi[0].ToString(); //this should work 

这样才排序为int，dizi会为你listbox1项排序的版本int。当你需要以此为string只使用ToString()的数组元素

此外，作为一个侧面说明：考虑使用intList和int.TryParse来从listBox.Items万一整数元素值的你不知道是否所有的由于某种原因，listBox.Items可能会转换为int。

Answer 2

转换为整数，你从列表框中删除

int[] dizi = new int[40]; 
for (int i = 0; i < listBox1.Items.Count; i++) { 
    dizi[i] = Convert.toInt32(listBox1.Items[i].ToString()); 
    } 

Array.Sort(dizi); 
label2.Text= Convert.toString(dizi[0]);