C＃“使用未分配的局部变量”

Question

I am having an issue with C# where I am getting the error

Use of an unassigned local variable

I am unsure as to why I am getting this error, as from reading other questions regarding this issue it is people having issues with declaring variables within If statements.

I do not know if this is a very basic error as I am new to C#, but any help would be appreciated.

Here is my code:

private void remProj_Click(object sender, EventArgs e) 
{
    string[] CurrentProjects;
    for (int i = 0; i < ProjectList.Items.Count; i++) 
    {
        CurrentProjects[i] = ProjectList.Items[i].ToString();
        MessageBox.Show(CurrentProjects[i]);
    }
}

I am getting the error on this line regarding the use of 'CurrentProjects':

CurrentProjects[i] = ProjectList.Items[i].ToString();

Answer 1

The error message saying that the variable CurrentProjects is not yet initialized. you you can escape from this issue by initializing the variable. For this particular scenario the best option for initializing is with the ProjectList.Items.Count . So Change the declaration as like this:

 string[] CurrentProjects= new string[ProjectList.Items.Count];

Answer 2

您必须先将数组初始化为一个大小：

string[] CurrentProjects = new string[ProjectList.Items.Count];

Answer 3

I also noticed this lately that you cannot create a variable without assigning a value or something to it. its an Update on c#, so basically anytime creating a variable, you must assign a value to it..

so

string[] CurrentProjects; 

should be

string[] CurrentProjects = new string[ProjectList.Items.Count];