具体如何执行此操作取决于表单之间的关系：如果您创建一个一个在另一个的实例，然后第一个是父母，第二个是孩子：

在两种形式之间传递信息，第1部分：父母对儿童 [ ^ ]

在两种形式之间传递信息，第2部分：儿童到父母 [ ^ ]

在两种表格之间传递信息，第3部分：儿童与儿童 [ ^ ]

Exactly how you do this depends on the relationship between the forms: If you create an instance of one in another, then the first is the parent, the second is the child:
Transferring information between two forms, Part 1: Parent to Child[^]
Transferring information between two forms, Part 2: Child to Parent[^]
Transferring information between two forms, Part 3: Child to Child[^]

将EditRecord表单的构造函数更改为接受一个字符串作为参数。

Change your EditRecord form's constructor to accept a string as a parameter.

private string GUID;

public EditRecord(string GUID)
{
     this.GUID = GUID;
}

然后当你在Form1中初始化EditRecord时，将值传递给构造函数。

Then when you initialise EditRecord in Form1 pass the value into the constructor.

EditRecord editRecord = new EditRecord(GUID);
editRecord.Visible = true